Set required permissions for the SDK size checks

[gpunto]

Goal

SDK size checks need write permissions for writing comments, so we're adding the relevant permission block. Up until now, this didn't cause problems because the token we're using has those permissions, but that doesn't work for Dependabot PRs. They receive a read-only token unless we declare permissions, which is why the comment step 403s on #1661.

Implementation

Add the permissions block

Testing

After merging this PR, we should update dependabot's PR and verify that the SDK size check succeeds

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 460b4751-80a6-430c-945d-5682d965b710

📥 Commits

Reviewing files that changed from the base of the PR and between 282e9fb and 3a4d097.

📒 Files selected for processing (1)

• .github/workflows/sdk-size-checks.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sdk-size-checks-permissions

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[github-actions]

PR checklist ✅

All required conditions are satisfied:

• Title length is OK (or ignored by label).
• At least one pr: label exists.
• Sections ### Goal, ### Implementation, and ### Testing are filled.

🎉 Great job! This PR is ready for review.

[github-actions]

SDK Size Comparison 📏

SDK	Before	After	Difference	Status
stream-video-android-core	12.02 MB	12.02 MB	0.00 MB	🟢
stream-video-android-ui-xml	5.68 MB	5.68 MB	0.00 MB	🟢
stream-video-android-ui-compose	6.28 MB	6.28 MB	0.00 MB	🟢

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[stream-public-bot]

🚀 Available in v1.23.0