* security: Update access token format (#56772)
Implement RFC 837 https://docs.google.com/document/d/1aC4gHB8Q5lurwVhc8SCxznR0blNJMKo7yIkpP7WShno/edit.
This change will update our access token format to `sgp_<instance_identifier>_<40_char_access_token>`, allowing access tokens to be securely tied back to instances
This will initially be disabled behind a feature flag until Cody extension updates have been rolled out to users.
(cherry picked from commit 6d604319bc)
* Remove Access Token Format Change Feature Flag (#58534)
* Removed feature flag for access token format change
* fix testcase
(cherry picked from commit f21c04dd7e)
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Co-authored-by: Will Dollman <will.dollman@sourcegraph.com>
1aab8b3bde