Validate default bucket configuration on startup

[TimCsaky]

Description

ticket: https://apps.nrs.gov.bc.ca/int/jira/browse/SHOWCASE-3337 .. and some other changes required to make the default bucket feature optional.

• check default bucket doesnt also exist in database (prevents data integrity issues)
• simplify getBucket() function to always throw if no bucket found, update references to this function
• update github environment files with change of variables naming

Types of changes

Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• [x] I have read the CONTRIBUTING doc
• [x] I have checked that unit tests pass locally with my changes
• [x] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation (if appropriate)

Further comments

[github-actions[bot]]

Coverage Report

Totals
Statements:	52.45% ( 2466 / 4702 )
Methods:	42.54% ( 268 / 630 )
Lines:	58.67% ( 1496 / 2550 )
Branches:	46.12% ( 702 / 1522 )

[codeclimate[bot]]

Code Climate has analyzed commit d5941aee and detected 2 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Complexity	2

The test coverage on the diff in this pull request is 81.8% (50% is the threshold).

This pull request will bring the total coverage in the repository to 58.6% (0.1% change).

View more on Code Climate.