Fix benchmarks upload GH Action

[Akirathan]

Fixes the Benchmarks Upload action that is failing since 2024-12-09. Also adds automatic generation of enso-org/engine-benchmark-results:cache/index.json file.

Pull Request Description

Modifies the Benchmarks Upload job to also upload special cache/index.json file that maps filenames in the cache to their timestamps.

This is necessary for #10212 but it is also good for an Enso workflow that analyses benchmarks from the locally cloned repo. (The workflow will soon be pushed to the https://github.com/enso-org/engine-benchmark-results repo)

Important Notes

Moreover, the Benchmarks Upload job fails since yesterday (https://github.com/enso-org/enso/actions/runs/12269442294/job/34233007971), because there is an old workflow ID used for the engine benchmarks.

To allow more convenient testing of the Action, I have added an ability to trigger this action manually in 857c086

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• The documentation has been updated, if necessary.
• Unit tests have been written where possible.
• If meaningful changes were made to logic or tests affecting Enso Cloud integration in the libraries,
  or the Snowflake database integration, a run of the Extra Tests has been scheduled.
  • If applicable, it is suggested to paste a link to a successful run of the Extra Tests.

[Akirathan]

index.json added to the engine-benchmark-results repo in enso-org/engine-benchmark-results@20f3623

[radeusgd]

Definitely not for now, but I'm wondering we could at some point move this script into Enso :)

[radeusgd]

I don't really know the script well enough to be able to tell much, but on the surface the changes seem ok.