Use GHA id-token for sccache-dist auth token

[trxcllnt]

Use the GitHub OIDC token for sccache-dist auth instead of the org's secrets.GIST_REPO_READ_ORG_GITHUB_TOKEN personal access token.

This change is already implemented, this PR just removes any references to GIST_REPO_READ_ORG_GITHUB_TOKEN.

[coderabbitai]

📝 Walkthrough

Walkthrough

Removed sccache-dist-token-secret-name: GIST_REPO_READ_ORG_GITHUB_TOKEN property from workflow job definitions across three GitHub Actions workflow files. The change affects 15 workflow step configurations in total with no modifications to control flow or error handling.

Changes

Cohort / File(s)	Summary
GitHub Actions Workflow Configuration .github/workflows/build.yaml, .github/workflows/pr.yaml, .github/workflows/test.yaml	Removed sccache-dist-token-secret-name: GIST_REPO_READ_ORG_GITHUB_TOKEN property from workflow job definitions (4 jobs in build.yaml, 8 in pr.yaml, and 3 in test.yaml).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

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Note

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[trxcllnt]

/merge