Backport #29064 by @wolfogre
On the release list page, if the user doesn't have the permission to
read code, the code links will lead to 404 pages or api errors:
<img width="1297" alt="image"
src="a74fbc63-6dd6-43c6-853c-28acdbfdcb4e">
After this PR:
<img width="1297" alt="image"
src="a626373d-c2df-40a9-8fed-1b12ff6bc56f">
And this PR also removed some dead code. After #23465, the tag list page
has an independent template, and all `IsTag` in the release list
template are always false.
Co-authored-by: Jason Song <i@wolfogre.com>
7ed79b748f