ci: support full validation on workflow_dispatch (no PR context)

[felickz]

What

Fixes ci.yml ("Build CodeQL Packs") so it can be run via workflow_dispatch
on any branch and get a real, full compile-and-test validation - without
requiring an open pull request.

Why

While validating the CLI 2.24.3 bump (#179 / #180), we discovered ci.yml
silently assumed every run has a PR context (github.event.number). For
workflow_dispatch runs this value is empty, which broke things two ways:

1. Crash before compiling anything. pr-compile.sh/pr-suites-packs.sh
   were invoked with unquoted ${{ github.event.number }}. When empty, bash
   word-splitting drops the argument entirely, shifting LANGUAGE into
   position $1 and leaving $2 unset - set -u then throws
   unbound variable immediately, before codeql query compile ever runs.
2. Steps silently skipped. Every step is gated on
   steps.changes.outputs.src == 'true' from dorny/paths-filter, which is
   PR-diff-based and not meaningful for a manual "verify everything" run.

This is exactly the gap that let PR #179 get merged on the strength of the
wrong CI signal (the repo's own CodeQL self-scan Analyze jobs looked green,
but the real compile-and-test job never actually re-ran on the fix commit).

Changes

• Quote the PR-number/language args passed to pr-compile.sh and
  pr-suites-packs.sh so an empty value is passed as an explicit empty
  string instead of vanishing.
• Add || github.event_name == 'workflow_dispatch' to every
  steps.changes.outputs.src == 'true' condition (12 occurrences across
  compile-and-test, extensions, library-sources, and configs jobs)
  so a manual dispatch always runs every step regardless of the path filter.
• Give pr-compile.sh, pr-suites-packs.sh, and pr-configs.sh a "full
  mode" fallback that activates whenever PR_NUMBER is empty: instead of
  gh pr view/gh pr comment (which require a PR), each script enumerates
  the relevant files directly from the filesystem and skips PR-comment
  logic. Kept as single dual-mode scripts (not separate PR/non-PR files) to
  avoid future logic drift.

Validation plan

• This PR itself will exercise the existing PR-based path unchanged
  (real pull_request event) - confirms no regression.
• After this is up, we'll workflow_dispatch this branch directly to prove
  the new non-PR path actually compiles all 7 languages without
  crashing.

[Copilot]

Pull request overview

This PR updates the “Build CodeQL Packs” CI workflow and its helper scripts so the workflow can be run via workflow_dispatch on any branch and still perform full compile/test validation without requiring a pull request context.

Changes:

• Adjusts ci.yml step gating so manual dispatch runs all relevant steps regardless of paths-filter output.
• Quotes PR number/language args passed into CI scripts to avoid argument shifting when PR context is missing.
• Adds “no PR number” fallback logic to the PR-oriented scripts to enumerate files/configs from the filesystem instead of using gh pr view and PR comments.

Show a summary per file

File	Description
.github/workflows/ci.yml	Allows workflow_dispatch to run the full validation path by bypassing PR-diff-based gating and quoting script arguments.
.github/scripts/pr-suites-packs.sh	Adds a non-PR mode that resolves all suites and rebuilds packs directly from the working tree.
.github/scripts/pr-configs.sh	Adds a non-PR mode that validates all configs/*.yml directly, and refactors compilation into a helper function.
.github/scripts/pr-compile.sh	Adds a non-PR mode for full strict compilation, but currently performs redundant compilation work (see PR comment).

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• Files reviewed: 4/4 changed files
• Comments generated: 1
• Review effort level: Low