add json validator on workspaces_agent_config_versions table
MR: Pending <!-- The first line of this issue description must be one of the following: 1. `MR: Pending` 2. `MR: <MR link with trailing +>`, 3. If there are multiple MRs: ``` MRs: - <MR 1 link with trailing +>` - <MR 2 link with trailing +>` - ... ``` 4. `MR: No MR` ...and the first description line of the MR should be `Issue: <Issue link with trailing +>` For more context, see: https://about.gitlab.com/handbook/engineering/development/dev/create/ide/index.html#relationship-of-issues-to-mrs --> <!-- The following sections should be filled out as part of the refinement process before the issue is prioritized. For more context, see: https://about.gitlab.com/handbook/engineering/development/dev/create/ide/#2-pre-iteration-planning-meeting --> ## Description Based on discussion [here](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/163572#note_2098884426), we would like to create jsonb schema validation on the model for both `object` and `object_changed`. The validation should be simple, and just very high level. And then we could remove both columns from the ignored_column in test case. ## Acceptance Criteria - [ ] have the jsonb validation method for both columns - [ ] remove both columns from the ignored_column ## Technical Requirements NA ## Design Requirements NA ## Impact Assessment NA ## User Story NA <!-- Replace with other type, e.g. bug or maintenance, if appropriate --> <!-- Replace with other subtype if appropriate --> <!-- By default, all issues start in the unprioritized status. See https://handbook.gitlab.com/handbook/engineering/development/dev/create/remote-development/#-planning-process --> <!-- For simplicity and to avoid triage bot warnings about missing workflow labels, we will default to issues starting at the refinement phase -->
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