Merge branch 'xanf-improve-graphql-error-handling' into 'master'

Add warning if graphql field is missing during fleet update

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/168351



Merged-by: Natalia Tepluhina <ntepluhina@gitlab.com>
Approved-by: Evan Read <eread@gitlab.com>
Approved-by: Nataliia Radina <nradina@gitlab.com>
Approved-by: Natalia Tepluhina <ntepluhina@gitlab.com>
Co-authored-by: Illya Klymov <iklymov@gitlab.com>