Update edgecontainer cluster/node-pool timeout

[rayccz2]

Updating the edgecontainer cluster/node-pool operation timeout, since now the LCP cluster enabled the Edge OS pinning which can take one hr per machine.

Release Note Template for Downstream PRs (will be copied)

edgecontainer: increased default timeout on `google_edgecontainer_cluster`, `google_edgecontainer_node_pool` to 480m from 60m

[modular-magician]

Hello! I am a robot. It looks like you are a: Community Contributor Googler Core Contributor. Tests will run automatically.

@rileykarson, 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.

Terraform GA: Diff ( 4 files changed, 12 insertions(+), 12 deletions(-))
Terraform Beta: Diff ( 4 files changed, 12 insertions(+), 12 deletions(-))

[modular-magician]

Tests analytics

Total tests: 2
Passed tests 2
Skipped tests: 0
Affected tests: 0

Click here to see the affected service packages

• edgecontainer

$\textcolor{green}{\textsf{All tests passed in REPLAYING mode.}}$
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