Buildkite: Remove .ci folder

[leo-ri]

What does this PR do?

Remove ci-folder

Why is it important?

Buildkite should be used in the first place

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: c2c3228

[elasticmachine]

💔 Build Failed

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Build stats

• Start Time: 2023-08-22T09:30:20.906+0000

• Duration: 11 min 9 sec

Test stats 🧪

Test	Results
Failed	0
Passed	791
Skipped	25
Total	816

Steps errors

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Load a resource file from a library

• Took 0 min 0 sec . View more details here
• Description: approval-list/elastic/elastic-agent-libs.yml

go test

• Took 0 min 17 sec . View more details here
• Description: go test -v ./...

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