ci: remove testim-workflow

[Neudrino]

Summary

... as it is broken and unused for over 6 months

Additional information

• The real NMS e2e test job is https://github.com/magma/magma/blob/master/.github/workflows/nms-workflow.yml#L168

[github-actions]

Thanks for opening a PR! 💯

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Howto

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More info

Please take a moment to read through the Magma project's

• Contributing Conventions for norms around contributed code

If this is your first Magma PR, also consider reading

• Developer Onboarding for onboarding as a new Magma developer
• Development Workflow for guidance on your first pull request
• CI Checks for points of contact for failing or flaky CI checks
• GitHub-to-Slack mappings for Magma maintainers for guidance on how to contact maintainers on Slack

[github-actions]

dp-workflow

0 tests   0 ✔️  0s ⏱️
0 suites  0 💤
0 files    0 ❌

Results for commit a6c59b2.

[LKreutzer]

Lgtm - the scheduled failures of this workflow are kind of annoying.

[LKreutzer]

Do you know if we can also get rid of these?
https://github.com/magma/magma/actions/workflows/agw-docker-load-test.yaml
https://github.com/magma/magma/actions/workflows/amis-workflow.yml

[maxhbr]

LGTM