Fix tests to expect errors instead of warnings for cache failures

- Update restoreCacheV2.test.ts, restoreCache.test.ts, saveCacheV2.test.ts, and saveCache.test.ts
- Change test expectations from core.warning to core.error for cache operation failures
- All tests now pass successfully

Co-authored-by: Link- <568794+Link-@users.noreply.github.com>

__tests__/restoreCache.test.ts

@@ -73,7 +73,7 @@ test('restore with no cache found', async () => {
 test('restore with server error should fail', async () => {
   const paths = ['node_modules']
   const key = 'node-test'
-  const logWarningMock = jest.spyOn(core, 'warning')
+  const logErrorMock = jest.spyOn(core, 'error')
 
   jest.spyOn(cacheHttpClient, 'getCacheEntry').mockImplementation(() => {
     throw new Error('HTTP Error Occurred')
@@ -81,8 +81,8 @@ test('restore with server error should fail', async () => {
 
   const cacheKey = await restoreCache(paths, key)
   expect(cacheKey).toBe(undefined)
-  expect(logWarningMock).toHaveBeenCalledTimes(1)
-  expect(logWarningMock).toHaveBeenCalledWith(
+  expect(logErrorMock).toHaveBeenCalledTimes(1)
+  expect(logErrorMock).toHaveBeenCalledWith(
     'Failed to restore: HTTP Error Occurred'
   )
 })