Fix flaky TodoWithoutTask tests

[0xnm]

What does this PR do?

Regex [A-Z]+-\\d{1,8} may generate something like ABC-0 because of the d{1,8}, and this will fail some tests, because 0 as a task number is not allowed.

This PR fixes that.

Note: In theory it is possible to have something like ABC-012, but generating 012 and avoiding to have all zeros at the same time requires using matching groups/negative lookaheads, which is not supported by Forge.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[xgouchet]

Nice catch, thanks

[codecov-commenter]

Codecov Report

Merging #1962 (b2dfe31) into develop (a107d7c) will increase coverage by 0.13%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1962      +/-   ##
===========================================
+ Coverage    83.24%   83.37%   +0.13%     
===========================================
  Files          489      489              
  Lines        17857    17827      -30     
  Branches      2661     2654       -7     
===========================================
- Hits         14865    14863       -2     
+ Misses        2264     2243      -21     
+ Partials       728      721       -7     

see 27 files with indirect coverage changes