reinstall changes to `rose-suite.conf`

[wxtim]

Fixes two separate, but related bugs (one of which was partially protecting us from the other, except when using rose stem):

1. Rsync Output

cylc reinstall relied on the rsync stdout being empty to choose not to reinstall. Under some circumstances messages such as cannot delete dirctory: opt were causing re-installations unnecessarily.

2. rose-suite.conf reinstallation

Under many circumstances the first bug was allowing re-installation to be triggered when only the rose-suite.conf had changed, despite rose-suite.conf being on the list of files excluded from the rsync.

With the first bug fixed users could change the source rose-suite.conf and have Cylc tell them that nothing required re-installing.

Check List

• [x] I have read CONTRIBUTING.md and added my name as a Code Contributor.
• [x] Contains logically grouped changes (else tidy your branch by rebase).
• [x] Does not contain off-topic changes (use other PRs for other changes).
• [x] Applied any dependency changes to both setup.cfg and conda-environment.yml.
• [x] Tests will be in a Cylc Rose PR https://github.com/cylc/cylc-rose/pull/178
• [x] CHANGES.md entry included if this is a change that can affect users

[oliver-sanders]

Couple of small comments, otherwise LGTM, tested as working.

[oliver-sanders]

Cylc (re)install does not copy a nested rose-suite.conf file. I don't think this is an issue for now

ATM there is no support for nesting so this is ok.

[oliver-sanders]

@wxtim could you rebase onto 8.0.x and fix the changelog.