[8.16](backport #6530) Fix AGENT_COMMIT_OVERRIDE environment variable name #6536
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What does this PR do?
In PR #4403 a new environment variable has been introduced to use a commit hash consistent with the hash of the elastic-agent-core DRA binary used. The env var name was not initialized and ended up using "MANIFEST_URL" which is obviously incorrect.
This commit sets the correct name AGENT_COMMIT_OVERRIDE to avoid using the manifest url as a commit hash
Why is it important?
It allows for testing elastic-agent packaging with commands like
Checklist
[ ] I have read and understood the pull request guidelines of this project.[ ] My code follows the style guidelines of this project[ ] I have commented my code, particularly in hard-to-understand areas[ ] I have made corresponding changes to the documentation[ ] I have made corresponding change to the default configuration files[ ] I have added tests that prove my fix is effective or that my feature works[ ] I have added an entry in./changelog/fragments
using the changelog tool[ ] I have added an integration test or an E2E testDisruptive User Impact
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This is an automatic backport of pull request #6530 done by [Mergify](https://mergify.com).