Save the unsaved form changes on close task operation

[sandhiyakavi]

Description:

Refer #800 (comment)

[vikasrohit]

@maxceem we have to keep the buttons like Close Task and Launch as Active disabled if the form is dirty and let the user first save the form using Save or Save Draft button.

[maxceem]

From Vikas:

this one looks important to me as people are tending to fall into this use case pretty often.
They are assigning the task to a member and then marking it closed
the other easy option for tackling this could be to save the form changes along with close task operation as well
what do you think?

I guess saving before closing makes sense:

• it feels like natural behavior
• I guess technically it would be easier to implement

[vikasrohit]

Go ahead with this. fyi @acshields

[vikasrohit]

@sandhiyakavi fyi, I have updated the title of the issue to reflect the new solution instead of disabling the button because disabling the button is more tricky and error prone and we found the other way to be more natural way as well as suggested by @maxceem

[maxceem]

@vikasrohit do you know any project on DEV with a billing account attached? We need it to test Close Task workflow.