chore(storage): fix order dependency in get_object_contexts test

[aandreassa]

Currently this fails if the order is incorrect, introducing flakiness:

1) Failure:
Files Snippets::get_object_contexts#test_0001_fetches all object contexts [acceptance/files_test.rb:341]:
In stdout.
--- expected
+++ actual
@@ -1,4 +1,4 @@
 "Custom Contexts for path/file_name_9d512d3ea21775ecf8d953f9f31138f6.txt are:
-Key: my-custom-key, Value: my-custom-value
 Key: my-custom-key-2, Value: my-custom-value-2
+Key: my-custom-key, Value: my-custom-value
 "

Noticed in #34751

chore(storage): pass user_project when resetting requester_pays in samples cleanup

Fixes an order dependency where resetting requester_pays in the after cleanup hook failed
due to a missing user_project parameter, breaking subsequent tests.

Example error:

  1) Error:
Files Snippets#test_0001_list_files:
Google::Cloud::InvalidArgumentError: required: Bucket is a requester pays bucket but no user project provided.
    /workspace/google-cloud-storage/lib/google/cloud/storage/service.rb:1037:in 'Google::Cloud::Storage::Service#execute'
    /workspace/google-cloud-storage/lib/google/cloud/storage/service.rb:167:in 'Google::Cloud::Storage::Service#patch_bucket'
    /workspace/google-cloud-storage/lib/google/cloud/storage/bucket.rb:3467:in 'Google::Cloud::Storage::Bucket#patch_gapi!'
    /workspace/google-cloud-storage/lib/google/cloud/storage/bucket.rb:656:in 'Google::Cloud::Storage::Bucket#requester_pays='
    acceptance/files_test.rb:80:in 'block (2 levels) in <top (required)>'

[aandreassa]

@bajajneha27 or @cpriti-os if I could get a LGTM on this flaky test. TY!