remove foreign key from actor_oauth_parameter table

[subodh1810]

In the migration V0_32_8_001__AirbyteConfigDatabaseDenormalization we were skipping writing the source oauth parameter and destination oauth parameter in the new normalized table actor_oauth_parameter if the workspace was null but that was a mistake. If the workspace is null it means the param should be used globally
ref :

airbyte/airbyte-db/lib/src/main/java/io/airbyte/db/instance/configs/migrations/V0_32_8_001__AirbyteConfigDatabaseDenormalization.java

Line 413 in e17fa5b

if (workspaceDoesNotExist(sourceOAuthParameter.getWorkspaceId(), ctx)) {

[davinchia]

I'm approving since I don't want to block you.

PR itself makes sense but I don't entirely understand what the initial issue was and thus how this solves it.

I also wasn't able to find the actor table in https://docs.google.com/document/d/10jX7yhkPfP3_8DwasQNw73y_WVXuyJQ0q1wvB8j7uSY/edit#.

Would appreciate a longer PR description in the future.