* implement browser clipboard service

* actually register the clipboard service

* update all refs to newly async funcs

* addressing comments

* small fixes

* all asyncs as a result of readText

* fix unit test

* cleanup for writeText refs

* cleanup and reduce diff noise

* qfix

* address feedback

For #76442

#76489

- Allow placeholders in the webviewEndpoint. This is required to support serving each webview from its own origin
- Add tests for toWebviewResource

related to #63566

For #76489

#76442

#76442

For #76442

clean up user data provider