Add ability to exclude job event and job data from backup

[kdelee]

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Feature Summary

Sometimes for users with lots of data, they are told they can manually dump the data and pass --exclude-table-data '*.main_jobevent' and/or --exclude-table-data '*.main_job'

It would be useful if we could do that for the AWXBackup in

awx-operator/roles/backup/tasks/postgres.yml

Lines 87 to 94 in e966e92

	pgdump: >-
	pg_dump --clean --create
	-h {{ resolvable_db_host }}
	-U {{ awx_postgres_user }}
	-d {{ awx_postgres_database }}
	-p {{ awx_postgres_port }}
	-F custom
	no_log: "{{ no_log }}"

[sdktr]

Adding an optional 'pg_dump_command_option' variable could provide a generic fix? Like:

     pgdump: >- 
       pg_dump --clean --create 
       -h {{ resolvable_db_host }} 
       -U {{ awx_postgres_user }} 
       -d {{ awx_postgres_database }} 
       -p {{ awx_postgres_port }} 
       -F custom 
       {{ pg_dump_command_option | default() }}