feat: support for existing event notification instance

[iamar7]

Description

Resolves: https://github.com/terraform-ibm-modules/stack-ibm-core-security-services/issues/50

Release required?

• [ ] No release
• [ ] Patch release (x.x.X)
• [x] Minor release (x.X.x)
• [ ] Major release (X.x.x)

Release notes content

Run the pipeline

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Checklist for reviewers

• [ ] If relevant, a test for the change is included or updated with this PR.
• [ ] If relevant, documentation for the change is included or updated with this PR.

For mergers

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[iamar7]

/run pipeline

[iamar7]

/run pipeline

[iamar7]

/run pipeline

[iamar7]

/run pipeline

[iamar7]

/run pipeline

[iamar7]

/run pipeline

[iamar7]

/run pipeline

[iamar7]

/run pipeline

[iamar7]

/run pipeline

[terraform-ibm-modules-ops]

:tada: This issue has been resolved in version 1.4.0 :tada:

The release is available on:

• GitHub release
• v1.4.0

Your semantic-release bot :package::rocket: