Allow Cylc VIP to work with named runs.

[wxtim]

Closes #5310

• I have read CONTRIBUTING.md and added my name as a Code Contributor.
• Contains logically grouped changes (else tidy your branch by rebase).
• Does not contain off-topic changes (use other PRs for other changes).
• Applied any dependency changes to both setup.cfg and conda-environment.yml.
• Tests are included (or explain why tests are not needed).
• CHANGES.md entry included if this is a change that can affect users

[datamel]

I think the tests need checking on this one.

[oliver-sanders]

$ cylc install generic --run-name foo
INSTALLED generic/foo from ~/cylc-src/generic

$ cylc vip generic --run-name bar
$ cylc validate ~/cylc-src/generic
Valid for cylc-8.1.0
$ cylc install ~/cylc-src/generic
INSTALLED generic/bar from ~/cylc-src/generic
$ cylc play generic

 ▪ ■  Cylc Workflow Engine 8.1.0
 ██   Copyright (C) 2008-2023 NIWA
▝▘    & British Crown (Met Office) & Contributors

WorkflowFilesError: No flow.cylc or suite.rc in ~/cylc-run/generic

[oliver-sanders]

Could you rebase onto 8.1.x please.

[wxtim]

$ cylc install generic --run-name foo
INSTALLED generic/foo from ~/cylc-src/generic

$ cylc vip generic --run-name bar
$ cylc validate ~/cylc-src/generic
Valid for cylc-8.1.0
$ cylc install ~/cylc-src/generic
INSTALLED generic/bar from ~/cylc-src/generic
$ cylc play generic

 ▪ ■  Cylc Workflow Engine 8.1.0
 ██   Copyright (C) 2008-2023 NIWA
▝▘    & British Crown (Met Office) & Contributors

WorkflowFilesError: No flow.cylc or suite.rc in ~/cylc-run/generic

I haven't been able to replicate this.

[MetRonnie]

I cannot reproduce Oliver's "No flow.cylc or suite.rc in ~/cylc-run/generic"

[MetRonnie]

Will this need a cylc-rose PR?

[wxtim]

Will this need a cylc-rose PR?

I don't think cylc-run uses the changed interfaces, and running the tests suggests that it doesn't.