tests: declare class:Collection / collection_type (rnaseq-sr)

[jmchilton]

Final piece of the #1286 split. Same mechanical change as #1290/#1291/#1292: class: Collection on outputs that already carried element_tests:, and type: -> collection_type: on nested collection elements. No .ga files or expected data touched.

Why this is standalone

rnaseq-sr was held back from #1292 because it errors in CI with:

Workflow was not invoked; the following required tools are not installed:
.../featurecounts/featurecounts/2.1.1+galaxy1

That is not a tool or workflow problem — it is the CI harness bug filed as #1294. The shed-installed data-table config does not survive Galaxy restarts, so the second and later consumer of featurecounts within a chunk cannot load it. rnaseq-pe runs first, installs featurecounts, and passes; rnaseq-sr inherits it and fails.

As the only featurecounts consumer in this PR's CI run, rnaseq-sr installs the tool fresh and registers the data tables — so it should pass here. (rnaseq-pe went out separately in #1292.)

This PR therefore doubles as the empirical check on #1294's diagnosis: if it goes green, the harness bug is confirmed and rnaseq-sr itself is fine.

[mvdbeek]

Attention: deployment skipped!

https://github.com/galaxyproject/iwc/actions/runs/29392418499