AO3-6587 Allow # as initial character in Ticket ID Field when editing a profile or pseud

[scottsds]

Issue

https://otwarchive.atlassian.net/browse/AO3-6587

Purpose

This pull request will allow AO3 Support staffers to copy/paste Ticket ID numbers from their internal tools. This copied data often includes an "#" character, which staffers have to manually erase.

Previously, a live validation check would prevent staffers from hitting the "Update" button. Now, live validation is removed and the initial "#" is automagically stripped from the copied Ticket ID before validation.

Validation will allow an "#" in the first character position. If an "#" or any other character is in any other position, validation will fail.

Testing Instructions

Automated tests were updated to check for the above validation conditions, they can be manually checked as follows:

Instructions for Passing Validation

1. Copy the ticket ID from the ticketing platform and note that it comes with an "#" prefix.
2. Log in to the Archive as PAC admin or superadmin.
3. Edit a user profile (https://test.archiveofourown.org/users/USERNAME/edit) OR pseud (https://test.archiveofourown.org/users/USERNAME/pseuds/PSEUDNAME.
4. Paste the ticket ID with (or without) the "#" prefix.
5. Click 'Update'.
6. Be joyous that the update happens without error.

Instructions for Failing Validation

1. Copy the ticket ID from the ticketing platform and note that it comes with an "#" prefix.
2. Log in to the Archive as PAC admin or superadmin.
3. Edit a user profile (https://test.archiveofourown.org/users/USERNAME/edit) OR pseud (https://test.archiveofourown.org/users/USERNAME/pseuds/PSEUDNAME.
4. Paste the ticket ID, change initial # to any other character, or add an "#" or any other character to any other position.
5. Click 'Update'.
6. Validation fails.

References

Are there other relevant issues/pull requests/mailing list discussions?
https://otwarchive.atlassian.net/browse/AO3-6156
https://otwarchive.atlassian.net/browse/AO3-4595

[Bilka2]

The code looks good, but there are some things to improve for i18n.

[Bilka2]

Thank you!