Fixes for sequential queue issues

[szymonzalarski98]

Explanation of Change

This PR re-lands the sequential queue fixes from #84622 (which was reverted due to deploy blockers #85671, #85669, #85673, #85708, #85755) with additional fixes for the file upload regression.

What was reverted PR #84622 doing:
Fixing 4 bugs in PersistedRequests.ts and the write pipeline (Issue #80759):

• Issue 2: API.write() returned Promise.resolve() immediately — nothing in the write pipeline was awaited. Fix: save() returns Promise<void>, push() returns persistence promise, processRequest() awaits it.
• Issue 3: processNextRequest() and rollbackOngoingRequest() didn't persist changes to disk. Fix: both now use Onyx.multiSet() to atomically persist queue + ongoing request.
• Issue 4: Onyx connect callback blindly overwrote in-memory state with stale disk data. Fix: after initialization, callback returns early (in-memory is authoritative). Multi-tab support preserved via knownRequestIDs merge.
• Issue 5: Conflict resolver saw stale queue (consequence of Issue 4, fixed automatically).

Why it was reverted — deploy blockers (file uploads broken):
processNextRequest() now always persists ongoingRequest via Onyx.multiSet(). Combined with Onyx 3.0.46 (which made callbacks synchronous), this caused two problems:

1. The synchronous callback overwrote ongoingRequest with a JSON-serialized copy where File objects became {}. Then return ongoingRequest returned the corrupted object → server received empty file → upload failed.
2. File/Blob objects cannot be cloned into IndexedDB → DataCloneError red screen on every file upload.

How we fixed the deploy blockers:

1. return nextRequest instead of return ongoingRequest — local variable is unaffected by the synchronous callback.
2. Skip persisting ongoingRequest to PERSISTED_ONGOING_REQUESTS when request data contains File/Blob. These requests can't survive a crash anyway (File references are lost on restart).

Additional fix:

• requestIndex = Date.now() instead of 0 — prevents cross-tab requestID collisions.
• Removed CONST.DEFAULT_NUMBER_ID fallback in knownRequestIDs (reviewer feedback from @adhorodyski).

Fixed Issues

$ #80759
$ #85671
$ #85669
$ #85673
$ #85708
$ #85755

Tests

1. Upload an attachment in any chat → verify it uploads successfully, no "No content to add" error
2. Go to workspace settings → click workspace avatar → upload image → Save → verify avatar updates
3. Create a manual expense with receipt → verify receipt is displayed
4. Go to workspace → Tags → Import → Multi-level tags → upload CSV file → verify import succeeds
5. Open two browser tabs, create expense in tab 1, submit it in tab 2 → verify it works
6. Go offline, create several expenses, go back online → verify all requests are processed in order
7. Open DevTools console → repeat steps 1-4 → verify no DataCloneError appears

• Verify that no errors appear in the JS console

Offline tests

1. Go offline (DevTools → Network → Offline)
2. Create 3 expenses with receipts
3. Go back online
4. Verify all 3 expenses are created and receipts are displayed
5. Verify no duplicate or missing requests

QA Steps

1. File upload (deploy blocker fix): Go to any chat → click attachment icon → upload a file → verify it uploads without error
2. Workspace avatar (deploy blocker fix): Go to workspace settings → upload new avatar → Save → verify avatar changes
3. Receipt upload (deploy blocker fix): Create manual expense → attach receipt from computer → verify receipt is displayed
4. Multi-level tags import (deploy blocker fix): Go to workspace → Tags → Import → Multi-level tags → upload CSV → verify import succeeds without "Import failed" error
5. Multi-tab (regression check): Open two tabs → create expense in tab 1 → go to tab 2 → submit the expense → verify it submits successfully
6. Offline resilience: Go offline → create 2-3 expenses → go online → verify all processed
7. Console check: Open DevTools console → repeat steps 1-4 → verify no DataCloneError or other errors

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
  • I added steps for the expected offline behavior in the Offline steps section
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  • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
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• I included screenshots or videos for tests on all platforms
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  • Android: Native
  • Android: mWeb Chrome
  • iOS: Native
  • iOS: mWeb Safari
  • MacOS: Chrome / Safari
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Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari