Allow reporting a room when rejecting an invite. (#29570)

* Add report room dialog button/dialog.

* Update copy

* fixup tests / lint

* Fix title in test.

* update snapshot

* Add unit tests for dialog

* lint

* First pass at adding a report room on invite.

* Use a single line input field for reason to avoid bumping the layout.

* Fixups

* Embed reason to make it clear on grouping

* Revert accidental commit

* lint

* Add some playwright tests.

* tweaks

* Make ignored users list more accessible.

* i18n

* Fix sliding sync test.

* Add unit test

* Even more unit tests.

* move test

* Update to match designs.

* remove console statements

* fix css

* tidy up

* improve comments

* fix css

* updates

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