[FIX] Adding Feature flag constant for Prompt service

[harini-venkataraman]

What

Adding feature flag constant to prompt service
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Why

To support remote storage migration
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How

Usage of FS APIs in the current implementation
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Can this PR break any existing features. If yes, please list possible items. If no, please explain why. (PS: Admins do not merge the PR without this section filled)

No, the changes are under feature flag.
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Database Migrations

Not applicable.
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Env Config

Not applicable.
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Relevant Docs

Not applicable.
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Related Issues or PRs

Checklist

I have read and understood the Contribution Guidelines.

[gaya3-zipstack]

Looks good.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

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