Migration lockout - disable tasks

• HM-5025: Migration lockout - disable tasks in #857

Migration lockout

• HM-5025: Migration Lockout in #856

Disable pre-lockout scheduled tasks

HM-5027: Disable scheduled tasks (#855)

* Disable scheduled tasks in celery

* Restore process_closed_briefs task to schedule

* Prevent closed brief emails being sent

Prevent category assessment and profile edit submissions

HM-5076: Prevent application and assessment submissions (#854)

* Prevent submission of assessments

* Removed unsaved profile edit notification message

* Remove application updates and audit event creation

* Remove ability to submit/update applications

* Update tests as applications cannotebe submitted

* Update test since evidence cannot be submitted

* Fix application tests

Seller application fix

HM-5113: Remove restriction on submitting new applications (#853)

* Remove restriction on submitting new applications

* Revert to original code

* Update tests for applications

Prevent seller sign up

• HM-5077: Prevent new seller sign ups and applications by in #851
• HM-5077: Prevent new seller sign ups (Update) in #852

BuyICT notice & opportunity closing date restrictions

• HM-4717: Restrict closing dates during migration period in #843
• HM-4871: Front page events in #850

JIRA environment variables

release-729

Cast Jira timeout/max retries environment variables to integers (#849)

JIRA REST API authentication update

• HM-4865: Jira API exception handling in #848

JIRA REST API authentication temporary fix

HM-4864: Jira REST API temporary fix (#847)

* Remove task test

* Remove Jira functionality