Address limitations of using nf-test sharding

[edmundmiller]

List post #6286 that aren't breaking but would be nice to have

Tasks

Beta Give feedback

1. Functioning Test Report
2. Smart number of shards
3. Avoid failing conda tests
4. Add branch checks for CI jobs

[edmundmiller]

On the conda failures, I see a few options going from short-term/making more maintence work to long-term

1. Implement some "exclude" type of mechanism in GitHub actions
2. Tag all of the tests that work with conda with a "conda" tag and we select for those using a --tag conda_works tag in the conda matrix profile
3. Address it at the root with working on In-verse tag selection askimed/nf-test#260

We could skip the conda tests in 3 until we get that implemented. Not the end of the world IMO given the conda headaches, but I'm biased.