Fix #29533, and add some tests for "base/paginate.tmpl"
(cherry picked from commit 8553b4600e3035b6f6ad6907c37cebd013fa4d64)
Conflicts:
services/contexttest/context_tests.go
trivial conflict because
"Improve user experience for outdated comments" was skipped
Clarify when "string" should be used (and be escaped), and when
"template.HTML" should be used (no need to escape)
And help PRs like #29059 , to render the error messages correctly.
(cherry picked from commit f3eb835886031df7a562abc123c3f6011c81eca8)
Conflicts:
modules/web/middleware/binding.go
routers/web/feed/convert.go
tests/integration/branches_test.go
tests/integration/repo_branch_test.go
trivial context conflicts
