chore(repo): parameterize stencil nightly (#28308)

Issue number: N/A

---------

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## What is the current behavior?
<!-- Please describe the current behavior that you are modifying. -->

when the stencil team wants to test a dev build of stencil against the
framework team's ci, they push a branch to this repo that overrides the
stencil nightly job's npm tag (replacing 'nightly' with the dev build
version) and manually kick off the nightly workflow. this commit would
eliminate the need for that first step there

## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->

update the stencil nightly job to accept any npm release tag, rather
than always default to 'nightly'. doing so allows the stencil team to
reuse this workflow for cases where we'd like to test a _dev_ build of
stencil by running it through the framework's ci process, without
landing the feature in stencil first.

I was able to test that `nightly` gets set by default (and the field is
required) by running the workflow from this branch.

I then also tested this against a dev build of Stencil:
![Screenshot 2023-10-09 at 9 45
41 AM](https://github.com/ionic-team/ionic-framework/assets/1930213/65613327-e5b6-475d-9bcd-b3c0d27019d9)

Interestingly enough, it helped me catch something to consider if we
were to accept the PR this dev build is accepted!


## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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and migration path for existing applications below. -->


## Other information

I considered making a separate workflow for this (rather than
override/use nightly) - it didn't quite seem worth the maintenance
effort 🤷
<!-- Any other information that is important to this PR such as
screenshots of how the component looks before and after the change. -->

.github/workflows/stencil-nightly.yml

@@ -8,7 +8,12 @@ on:
     # at 6:00 UTC (6:00 am UTC)
     - cron: '00 06 * * 1-5'
   workflow_dispatch:
-    # allows for manual invocations in the GitHub UI
+    inputs:
+      npm_release_tag:
+        required: true
+        type: string
+        description: What version should be pulled from NPM?
+        default: nightly
 
 # When pushing a new commit we should
 # cancel the previous test run to not
@@ -24,7 +29,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: ./.github/workflows/actions/build-core-stencil-prerelease
         with:
-          stencil-version: nightly
+          stencil-version: ${{ inputs.npm_release_tag || 'nightly' }}
 
   test-core-clean-build:
     needs: [build-core-with-stencil-nightly]
@@ -47,7 +52,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: ./.github/workflows/actions/test-core-spec
         with:
-          stencil-version: nightly
+          stencil-version: ${{ inputs.npm_release_tag || 'nightly' }}
 
   test-core-screenshot:
     strategy: