Refactor htmx and fetch-action related code (#37186)

This is the first step (the hardest part):

* repo file list last commit message lazy load
* admin server status monitor
* watch/unwatch (normal page, watchers page)
* star/unstar (normal page, watchers page)
* project view, delete column
* workflow dispatch, switch the branch
* commit page: load branches and tags referencing this commit

The legacy "data-redirect" attribute is removed, it only makes the page
reload (sometimes using an incorrect link).

Also did cleanup for some devtest pages.

eslint.config.ts

@@ -575,7 +575,6 @@ export default defineConfig([
       'no-restricted-imports': [2, {paths: [
         {name: 'jquery', message: 'Use the global $ instead', allowTypeImports: true},
         {name: 'htmx.org', message: 'Use the global htmx instead', allowTypeImports: true},
-        {name: 'idiomorph/htmx', message: 'Loaded in globals.ts', allowTypeImports: true},
       ]}],
       'no-restricted-syntax': [2, 'WithStatement', 'ForInStatement', 'LabeledStatement', 'SequenceExpression'],
       'no-return-assign': [0],