ci: Add --skip-version-update option to populate_tox.py

[alexander-alderman-webb]

Description

Add an option to hold versions back in test suites for a specified set of integrations.

This allows us to merge PRs which require updating tox.ini when a version incompatibility would otherwise be pulled in.

Issues

Reminders

• Please add tests to validate your changes, and lint your code using uv run ruff.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

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[github-actions]

Codecov Results 📊

✅ 90082 passed | ⏭️ 6300 skipped | Total: 96382 | Pass Rate: 93.46% | Execution Time: 320m 43s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +72
Passed Tests	📈 +72
Failed Tests	—
Skipped Tests	—

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2402 uncovered lines.
❌ Project coverage is 89.91%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
- Coverage    89.93%    89.91%    -0.02%
==========================================
  Files          192       192         —
  Lines        23803     23806        +3
  Branches      8216      8218        +2
==========================================
+ Hits         21406     21404        -2
- Misses        2397      2402        +5
- Partials      1345      1341        -4

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Generated by Codecov Action