Added smissing spec while creating NamespaceManagement CR from UI

[alkakumari016]

What type of PR is this?
/kind bug

What does this PR do / why we need it:
Some values like name and default spec is missing in the UI while creating the NamespaceManagement CR. This PR fixes that and adds some default values like name and spec.managedBy fields.

Have you updated the necessary documentation?

• Documentation update is required by this PR.
• Documentation has been updated.

Which issue(s) this PR fixes:

Fixes #?
GITOPS-7834

Test acceptance criteria:

• Unit Test
• E2E Test

How to test changes / Special notes to the reviewer:

[svghadi]

/lgtm

[svghadi]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: svghadi

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• OWNERS [svghadi]

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[varshab1210]

/lgtm

[openshift-ci]

@alkakumari016: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/v4.14-kuttl-sequential	5d8a3f7	link	false	/test v4.14-kuttl-sequential

Full PR test history. Your PR dashboard.

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[alkakumari016]

/retest