Relaxed account regex per ENG-83

[DanielHHowell]

Modified organization regex for better or worse, along with associated tests

[linear]

ENG-84 Update servoX account validation

ENG-83 Relax requirement on account ids

Currently we require a string that looks like an account name. This is enforced in servoX, which is also used in the live emulator.

Proposed validation: ^[\w\.-]{5,50}$

Expression we may want: ^(?!-)([A-Za-z0-9-.]+){5,50}

Once we agree on a validation, this should be applied in several places (see subtasks). Also, we should make sure all existing accounts match the new regex (or else servo upgrade may brick an app).

[linkous8]

Would be nice have a comment documenting the concerns we are constraining against but I don't think we should block for that (esp since this is likely to change in the future). Approved

[mjdeclerck]

Provisional approval. Can you please add the validation tests that were performed either in the PR comments or in ENG-83? I want to make sure that along with the inline documentation in the code is visible for future work/revisions. Thanks.

[linkous8]

LGTM