Reduce Gradle cache writers and converge on Develocity

[trask]

Applies the cache fixes from opentelemetry-java-instrumentation#19532 and opentelemetry-java-instrumentation#19533 to reduce GitHub Actions cache pressure and improve Develocity remote cache coverage.

[Copilot]

Pull request overview

This PR updates Gradle/Develocity configuration and GitHub Actions workflows to reduce Gradle GitHub cache writes by making most jobs cache read-only, while keeping a small set of trusted default-branch jobs as the only cache writers and aligning behavior with Develocity population goals.

Changes:

• Disable Gradle local build cache on authenticated main CI builds so executed tasks can populate Develocity, while keeping remote cache push enabled when the Develocity access key is present.
• Make multiple workflows and jobs use gradle/actions/setup-gradle in cache-read-only mode (release, CodeQL, semconv auto-update, and most matrix legs).
• In the reusable build workflow, restrict GitHub cache writes to one job per OS on the default branch and exclude caches/build-cache-1 from the Gradle User Home snapshot for those writer jobs.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
settings.gradle.kts	Adds Develocity/Gradle build cache toggles to disable local cache on authenticated main CI and centralizes remote push enablement logic.
.github/workflows/release.yml	Forces release-related Gradle cache usage to be read-only (both reusable build and direct Gradle setup steps).
.github/workflows/codeql.yml	Makes CodeQL’s Gradle setup read-only to avoid GitHub cache writes.
.github/workflows/build-common.yml	Implements the “three trusted writers” strategy and Gradle home cache excludes for the writer jobs.
.github/workflows/auto-update-semconv.yml	Makes the semconv auto-update workflow’s Gradle setup read-only.

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