Remove self_link from network security resources that don't expose it

[LucaPrete]

Removes self_link output parameters from network security resources that don't expose it through REST APIs.

This PR removes the self_link I added by mistake, even if it wasn't exported by REST APIs of the following resources:

• google_network_security_security_profile
• google_network_security_security_profile_group
• google_network_security_endpoint
• google_network_security_endpoint_association

Release Note Template for Downstream PRs (will be copied)

networksecurity: removed self_link output parameter from `google_network_security_security_profile`, `google_network_security_security_profile_group`, `google_network_security_endpoint`, `google_network_security_endpoint_association`

[github-actions]

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@roaks3, a repository maintainer, has been assigned to review your changes. If you have not received review feedback within 2 business days, please leave a comment on this PR asking them to take a look.

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 8 files changed, 60 deletions(-))
google-beta provider: Diff ( 8 files changed, 60 deletions(-))

Breaking Change(s) Detected

The following breaking change(s) were detected within your pull request.

• Field self_link within resource google_network_security_firewall_endpoint_association was either removed or renamed - reference
• Field self_link within resource google_network_security_firewall_endpoint was either removed or renamed - reference
• Field self_link within resource google_network_security_security_profile_group was either removed or renamed - reference
• Field self_link within resource google_network_security_security_profile was either removed or renamed - reference

If you believe this detection to be incorrect please raise the concern with your reviewer.
If you intend to make this change you will need to wait for a major release window.
An override-breaking-change label can be added to allow merging.

[modular-magician]

Tests analytics

Total tests: 37
Passed tests: 36
Skipped tests: 1
Affected tests: 0

Click here to see the affected service packages

• networksecurity

$\textcolor{green}{\textsf{All tests passed!}}$
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