fix: Rollbacking DB operation if helm operation fails during linking with devtron chart

[manish-agrawal-ai]

Description

If Linking an external helm chart gives error (from helm) then db operation should be rollback.

Fixes # #1381

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

by linking kubewatch chart

Checklist:

• The title of the PR states what changed and the related issues number (used for the release note).
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas