Renaming a MySQL/Postgres column clears the data from that column.

[mslourens]

Describe the bug
When changing the name of a column in MySQL or Postgres, the data from that column gets cleared.

To Reproduce
Steps to reproduce the behavior:

1. Go to the Data tab
2. Create a new MySQL or Postgres data connection
3. Click on a table inside the created data connection
4. Enter some data (if not already present)
5. Change the name of one the columns (which contain data)
6. Notice: the data from the renamed column disappears
7. Refresh the page to retrieve the data again
8. Notice: the data is still gone.

Expected behavior
The column should be renamed without changing the content of the column

Screenshots

change.column.name.mysql.mov

Desktop (please complete the following information):

• OS: MacOS 12.2.1
• Browser: Vivaldi
• Version: develop

Additional context
If this is somehow expected behavior, we should add a warning dialog saying that renaming a column will delete all data from that column.

[mike12345567]

Resolved as of #4834.