chore(github-actions): fine tune workflow orchestrator defaults (#30794)

Issue number: resolves #

---------

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## What is the current behavior?
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- "nightly" was the default choice and was available for manual trigger
when running `release-orchestrator`

## What is the new behavior?
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this PR. -->

- Set "dev" as the default choice (changed from "nightly")
- Removed "nightly" from manual workflow_dispatch options (only "dev"
and "production" remain)
- Simplified the `run-nightly` condition to only run on schedule
(`github.event_name == 'schedule'`)


## Does this introduce a breaking change?

- [ ] Yes
- [-] No

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## Other information

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screenshots of how the component looks before and after the change. -->

- Manual triggers (workflow_dispatch): Only "dev" (default) and
"production" are available
- Scheduled triggers: The nightly build continues to run automatically
every Monday–Friday at 6:00 UTC via the schedule trigger
- Trusted Publishers compliance: Maintained — all releases still go
through the single orchestrator workflow, ensuring the OIDC token is
issued from the whitelisted workflow

.github/workflows/release-orchestrator.yml

@@ -11,10 +11,9 @@ on:
         description: 'Which Ionic release workflow should run?'
         required: true
         type: choice
-        default: nightly
+        default: dev
         options:
           - dev
-          - nightly
           - production
       version:
         description: 'Which version should be published? (Only for production releases)'
@@ -54,7 +53,7 @@ permissions:
 
 jobs:
   run-nightly:
-    if: ${{ github.event_name == 'schedule' || (github.event_name == 'workflow_dispatch' && inputs.release-type == 'nightly') }}
+    if: ${{ github.event_name == 'schedule' }}
     permissions:
       contents: read
       id-token: write