chore: remove VSI extension DA

[ocofaigh]

Description

Remove VSI extension DA and all related resources / tests. I left the actual code in the patterns directory, bit it will no longer be used, published or tested anywhere

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[ocofaigh]

/run pipeline

[ocofaigh]

/run pipeline

[ocofaigh]

The test failed with:

2025-10-24T12:16:26.7219486Z │ {"incidentID":"385c3488-28ae-a018-bba5-3c2e5a1693eb","code":"A03e9b","description":"Failed
2025-10-24T12:16:26.7220096Z │ to create an API key with IAM. Revise your request and try
2025-10-24T12:16:26.7220511Z │ again.","type":"Authentication"}
2025-10-24T12:16:26.7221214Z │ ERROR:: FAILED TO RESET THE IAM API KEY

Unrelated to changes in this PR

[terraform-ibm-modules-ops]

🎉 This PR is included in version 8.9.0 🎉

The release is available on:

• GitHub release
• v8.9.0

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