[ci] fix: merge pre-commit-full into pre-commit (volcengine#3684)

### What does this PR do?

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Right now, the pre-commit-full will always fail as it doesn't install
related dependencies:
https://github.com/volcengine/verl/actions/runs/18251414892

And there's no reason to duplicate pre-commit for pre-commit-full as
they are defined as same workflow, so this PR moves manual triggers and
schedule to pre-commit and remove pre-commit-full

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- [X] Apply [pre-commit
checks](https://github.com/volcengine/verl/blob/main/CONTRIBUTING.md#code-linting-and-formatting):
`pre-commit install && pre-commit run --all-files --show-diff-on-failure
--color=always`
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Signed-off-by: Hollow Man <[email protected]>

Author: HollowMan6

.github/workflows/pre-commit-full.yml

@@ -3,11 +3,15 @@ name: pre-commit
 
 # No need to avoid / cancel lightweight pre-commit jobs
 on:
+  schedule:
+    - cron: "0 0 * * 0"
   pull_request:
   push:
     branches:
       - main
       - v0.*
+  # Allow manual triggering
+  workflow_dispatch:
 
 # Declare permissions just read content.
 permissions: