Add confirmation modal for adaptor changes with credentials

[lmac-1]

Description

When changing adaptors in the collaborative editor, users now see a confirmation modal warning that credentials will be reset. The modal only appears when:

• Changing to a different adaptor package (not just version)
• A credential is currently selected

Also optimizes Y.Doc synchronization to eliminate double-sync by ensuring version changes happen in a single operation rather than syncing @latest then the actual version.

Includes comprehensive test coverage for all confirmation scenarios.

Closes #4395

Validation steps

Setup:

1. Open collaborative editor and select a job with an adaptor
2. Click Connect and create a credential to add to that step

1. Confirmation appears when changing adaptors WITH credentials:

1. Click on the adaptor on the step to open adaptor picker
2. Select a different adaptor (e.g., switch from Salesforce to HTTP)
3. Expected: "Change Adaptor?" confirmation modal appears with warning
4. Click "Continue"
5. Expected: Credential clears, adaptor changes, version auto-selects latest version number

2. No confirmation when changing adaptors WITHOUT credentials:

1. Clear any selected credential
2. Click "Change" and select different adaptor
3. Expected: No confirmation, adaptor changes immediately

3. No confirmation when changing versions:

1. With credential set, change version in dropdown (don't click "Change")
2. Expected: No confirmation, version changes immediately

4. Cancel preserves state:

1. With credential set, click "Change" → select different adaptor
2. Click "Cancel" on confirmation
3. Expected: Original adaptor and credential unchanged, modal stays open

Additional notes for the reviewer

1. NOTE: Pressing Escape when the confirmation modal is open closes everything (confirmation + modal + inspector).
   This is consistent with existing behaviour for delete/reset confirmations throughout Inspector. If we want to
   change this so Escape only closes the confirmation dialog (leaving the parent modal open), that should be
   handled in a separate issue as it would require reworking how AlertDialog integrates with the keyboard
   shortcut priority system across the application.

AI Usage

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• I have used another model
• I have not used AI

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Pre-submission checklist

• I have performed an AI review of my code (we recommend using /review
  with Claude Code)
• I have implemented and tested all related authorization policies.
  (e.g., :owner, :admin, :editor, :viewer)
• I have updated the changelog.
• I have ticked a box in "AI usage" in this PR

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.31%. Comparing base (6f7c1ab) to head (ccf442b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4413      +/-   ##
==========================================
- Coverage   89.38%   89.31%   -0.07%     
==========================================
  Files         425      425              
  Lines       20135    20135              
==========================================
- Hits        17997    17983      -14     
- Misses       2138     2152      +14     

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[lmac-1]

@theroinaochieng this is ready for review. I have assigned you as one of the reviewers but please reassign depending on dev availability, thanks!

[doc-han]

The changes work fine in the JobForm but not for the FullScreenIDE. Hence, when I'm on the canvas and update the job form that's fine but when I'm in the code editor, the previous behaviour persists

[lmac-1]

Great catch @doc-han - will get this done now.

[lmac-1]

Anyone else looking at this - please hold off from reviewing further until tagged - I am uniting the adaptor configuration component today.