issue-13603-fix attachment terraform

[archanaponnada]

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Relates OR Closes #0000

Issue :
In ibm_scc_profile_attachment, notification is made mandatory which is incorrect

Fix :
In ibm_scc_profile_attachment, notification is made optional.

How will it work :

1. Now notification is optional, ie when notification is not given also system will accept.
2. If notification object is given and enabled=false, it will ignore controls object - we need to fix at code level.Tracked under issue#13603
3. If notification object is given and controls object id given - it will be ignore - we need to fix at code level.Tracked under issue#13603
   Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...