[MINOR][TESTS] Ignore GitHub Action and AppVeyor file changes in testing

### What changes were proposed in this pull request?

This PR aims to ignore `GitHub Action` and `AppVeyor` file changes. When we touch these files, Jenkins job should not trigger a full testing.

### Why are the changes needed?

Currently, these files are categorized to `root` and trigger the full testing and ends up wasting the Jenkins resources.
- #26555
```
[info] Using build tool sbt with Hadoop profile hadoop2.7 under environment amplab_jenkins
From https://github.com/apache/spark
 * [new branch]      master     -> master
[info] Found the following changed modules: sparkr, root
[info] Setup the following environment variables for tests:
```

### Does this PR introduce any user-facing change?

No. (Jenkins testing only).

### How was this patch tested?

Manually.
```
$ dev/run-tests.py -h -v
...
Trying:
    [x.name for x in determine_modules_for_files([".github/workflows/master.yml", "appveyor.xml"])]
Expecting:
    []
...
```

Closes #26556 from dongjoon-hyun/SPARK-IGNORE-APPVEYOR.

Authored-by: Dongjoon Hyun <[email protected]>
Signed-off-by: Dongjoon Hyun <[email protected]>
(cherry picked from commit d0470d6)
Signed-off-by: Dongjoon Hyun <[email protected]>

dev/run-tests.py

@@ -42,15 +42,20 @@ def determine_modules_for_files(filenames):
     """
     Given a list of filenames, return the set of modules that contain those files.
     If a file is not associated with a more specific submodule, then this method will consider that
-    file to belong to the 'root' module.
+    file to belong to the 'root' module. GitHub Action and Appveyor files are ignored.
 
     >>> sorted(x.name for x in determine_modules_for_files(["python/pyspark/a.py", "sql/core/foo"]))
     ['pyspark-core', 'sql']
     >>> [x.name for x in determine_modules_for_files(["file_not_matched_by_any_subproject"])]
     ['root']
+    >>> [x.name for x in determine_modules_for_files( \
+            [".github/workflows/master.yml", "appveyor.yml"])]
+    []
     """
     changed_modules = set()
     for filename in filenames:
+        if filename in (".github/workflows/master.yml", "appveyor.yml"):
+            continue
         matched_at_least_one_module = False
         for module in modules.all_modules:
             if module.contains_file(filename):