[ZEPPELIN-6253] fix: remove SNAPSHOT from version when building crede…

[hyo-ryeong]

What is this PR for?

Fixes a broken "Learn more" link on the credential page.

Zeppelin currently appends -SNAPSHOT to the version when constructing the documentation link, which results in a 404 page.
This PR removes -SNAPSHOT from the version and ensures it uses a valid documentation path.

Broken link (before):
https://zeppelin.apache.org/docs/0.12.0-SNAPSHOT/setup/security/datasource_authorization.html

Corrected link (after):
https://zeppelin.apache.org/docs/0.12.0/setup/security/datasource_authorization.html

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What type of PR is it?

• [x] Bug Fix

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What is the Jira issue?

JIRA: ZEPPELIN-6253

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How should this be tested?

1. Navigate to Credential page in Zeppelin.
2. Click the "?" (Learn more) link at the top right.
3. Confirm it opens a valid docs page without 404.

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Questions

• Does the license files need to update? → No
• Is there breaking changes for older versions? → No
• Does this need documentation? → No