Schema Change Detection 2: Sticky indicator at the top of connection page with connection detail under pending changes

[Abhishek-N]

Once a mail is sent at night if there is a schema change in a connection for an org, it should also save the details of the same in a table. This is done because we don't have to connect to source everytime in the connections page which takes time to load

• [x] Create a SchemaChange table that saves connection_id, org, schema_change (type)
• [x] Update the celery task to save these details in the table(add, update and delete row) by connection_id
• [x] connection_id should be unique in this table so that if the user manually checks for schema change it won't add a new row in the table
• [x] Write an api to fetch data from this table specific to org
• [x] In the connections page, we check from this api for schemaChange and if there is a schemaChange display connection and breaking change type in pending actions tab

[fatchat]

the SchemaChange table should not only contain the schema_change type, it should contain the details of the changes i.e. enough for you to show the user in the UI

[Abhishek-N]

PR: #904