feat(build): uniform ini parsing (#7429)

- Use the existing ini parser for the `lint-locale` and `lint-locale-usage` tooling.
- This discovered that the previous ini parser was not correctly parsing certain types of string, specifically those with `;` as it's seen as a comment. It now properly 'unescapes' that and is not seen as a comment break.
- Discovered-by: @fogti

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/7429
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Co-authored-by: Gusted <postmaster@gusted.xyz>
Co-committed-by: Gusted <postmaster@gusted.xyz>

build/lint-locale/lint-locale_test.go

@@ -60,7 +60,7 @@ func TestLocalizationPolicy(t *testing.T) {
 	t.Run("Escaped HTML characters", func(t *testing.T) {
 		assert.Empty(t, checkLocaleContent([]byte("activity.git_stats_push_to_branch = `إلى %s و\"`")))
 
-		assert.Equal(t, []string{"key: و\x1b[31m&nbsp\x1b[0m\x1b[32m\u00a0\x1b[0m"}, checkLocaleContent([]byte(`key = و `)))
+		assert.Equal(t, []string{"key: و\x1b[31m \x1b[0m\x1b[32m\u00a0\x1b[0m"}, checkLocaleContent([]byte(`key = و `)))
 	})
 }