Prevent read only forms form being auto saved

[avazirna]

Summary

This PR prevents read only forms from being auto saved as incomplete, which would allow them to be loaded and submitted again.

Safety Assurance

• If the PR is high risk, "High Risk" label is set
• I have confidence that this PR will not introduce a regression for the reasons below
• Do we need to enhance manual QA test coverage ? If yes, "QA Note" label is set correctly

Safety story

This only limits the scenarios where the auto-save feature is triggered.

[shubham1g5]

@avazirna I already PR'ed this - #2835 here, not sure if you are following slack messages.