[release/9.0-staging] Remove thread contention from Activity Start/St…

…op (#109359)

* Remove thread contention from Activity Start/Stop

Author:    algorithmsarecool <[email protected]>

* Fix ref parameters and whitespace

Author:    algorithmsarecool<[email protected]>

* PR feedback. - Reduce duplication - add comments and make code more obvious - Use IndexOf

Author:    algorithmsarecool <[email protected]>

* PR feedback to simplify locking strategy

* PR feedback, final nits

* package authoring

* Fix package authoring

* revert package authoring as it is not needed anymore in net9.0

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Co-authored-by: algorithmsarecool <[email protected]>
Co-authored-by: Tarek Mahmoud Sayed <[email protected]>