fix wrong file link in code search page (#15466) (#15486)

fix wrong file link in code search page (#15466) (#15486)

in previous the grenrated link is
``testg/testrepo/src/commit/....``
which is not right.

the right version is ``/testg/testrepo/.......``
(start wiht ``/``)
or ``http://127.0.0.1:3000/xxxxx`` (full link)

to make it hase same result with explore page
I choose the secound style.

fix #15438

Signed-off-by: a1012112796 <1012112796@qq.com>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: 6543 <6543@obermui.de>