Allow updates to the mtu property in the Network resource.

[AshwinGururagh]

Currently using terraform to update the mtu property of the Network results in forcing the replacement of the Network resource.

This change marks the mtu property as mutable, and instead uses the PATCH API on the Network resource to update the mtu property of the network.

Fixes hashicorp/terraform-provider-google#22543

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compute: fixed VPC Network's MTU to be updatable without forcing a replacement of the Network resource.

[github-actions]

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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 ( 2 files changed, 146 insertions(+), 1 deletion(-))
google-beta provider: Diff ( 2 files changed, 146 insertions(+), 1 deletion(-))

[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 ( 2 files changed, 146 insertions(+), 1 deletion(-))
google-beta provider: Diff ( 2 files changed, 146 insertions(+), 1 deletion(-))

[modular-magician]

Tests analytics

Total tests: 1196
Passed tests: 1111
Skipped tests: 84
Affected tests: 1

Click here to see the affected service packages

• compute

Action taken

Found 1 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

• TestAccComputeNetwork_mtuAndUpdate

Get to know how VCR tests work

[modular-magician]

🟢 Tests passed during RECORDING mode:
TestAccComputeNetwork_mtuAndUpdate [Debug log]

🟢 No issues found for passed tests after REPLAYING rerun.

---

🟢 All tests passed!

View the build log or the debug log for each test

[modular-magician]

Tests analytics

Total tests: 1196
Passed tests: 1111
Skipped tests: 84
Affected tests: 1

Click here to see the affected service packages

• compute

Action taken

Found 1 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

• TestAccComputeNetwork_mtuAndUpdate

Get to know how VCR tests work

[modular-magician]

🟢 Tests passed during RECORDING mode:
TestAccComputeNetwork_mtuAndUpdate [Debug log]

🟢 No issues found for passed tests after REPLAYING rerun.

---

🟢 All tests passed!

View the build log or the debug log for each test

[roaks3]

Code and tests LGTM