Invalidate process object in XPC connection termination watchdog
<rdar://problem/126373957>
Pull request: https://github.com/WebKit/WebKit/pull/28175
Committed 279326@main (989daa949491): <https://commits.webkit.org/279326@main> Reviewed commits have been landed. Closing PR #28175 and removing active labels.
Re-opened since this is blocked by bug 274902
Pull request: https://github.com/WebKit/WebKit/pull/29375
Committed 280261@main (a7a2ef1d4aba): <https://commits.webkit.org/280261@main> Reviewed commits have been landed. Closing PR #29375 and removing active labels.