chore: Return the client without performing a matchRepository when the application configures the plugin by name

[jsolana]

Closes https://github.com/argoproj/argo-cd/issues/17948

Modify the behavior during DetectConfigManagementPlugin to avoid transferring the entire repository to cmp-server when the application configures the plugin by name avoiding performance issues described here

Checklist:

• [X] Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• [X] The title of the PR states what changed and the related issues number (used for the release note).
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