[V2] Set global secret if both project and domain not provided

[popojk]

Tracking issue

n/a

Why are the changes needed?

We should set the secret under sandbox namespace as global secret if secret create without specifying project and domain.

What changes were proposed in this pull request?

Add fallback rule in secret service

How was this patch tested?

1. Create a secret without project and domain flyte create secret OPENAI_API_KEY --value secret123
2. We will get the secret in sandbox namespace

Labels

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• security: In case of vulnerabilities

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Setup process

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Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
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Related PRs

Docs link

• main
  • Flyte 2 WIP #6583
    • [V2] Set global secret if both project and domain not provided 👈