Rework search related tools

Problem to solve

Search related tools have unnecessarily large character size of tool descriptions. For example,

'gitlab_blob_search': 3320,
 'gitlab_issue_search': 3077,
'gitlab_merge_request_search': 1487,

We need to reduce the size without introducing breaking changes and achieve the same routing performance.

Proposal

Consult with search api team to understand what search syntax is supported and condense the description while improving or not changing the routing performance.

Further details

Links / references