[Enhancement] Add placeholders and warnings in the info section for credential input fields

[SamvelSimonyan]

Current behavior
Currently, there are no specific instructions or warnings in the info section of the credential input fields for gitlab Confluence, Jira,
Users can input URLs with additional paths or parameters, which may lead to incorrect configurations from a lot of users ( 5-10 requests per month)

Proposed Enhancement

1. Add instructional text in the info section of the credential input fields to guide users to input only the base URL
   for jira
   "Base URL only, e.g., https://{{domain}}.atlassian.net (no paths or parameters)"

for confluence
"Base URL only, e.g., https://{{domain}}.atlassian.net/wiki (no additional paths or parameters)"

for git
"Base URL only e.g. https://gitbud.epam.com (no paths or parameters)"

2. Add an FE warning message ( only warning, allow user to save ) if it is detected that the user inputted a URL with additional URL params , but not just the base URL

"Please remove paths and parameters. Enter base URL only (e.g., https://{{domain}}.atlassian.net)"

Acceptance criteria

• instructional text in the info section is added for GitLab Confluence and Jira credentials.
• A warning message is displayed when a URL with additional paths or parameters is detected.