[static] Increase pulumi workspace termination seconds

[nicu-da]

part of #689

should improve handling of updates by the workspace during resets

Pull Request Checklist

Cluster Testing

• If a cluster test is required, comment /cluster_test on this PR to request it, and ping someone with access to the DA-internal system to approve it.
• If a hard-migration test is required (from the latest release), comment /hdm_test on this PR to request it, and ping someone with access to the DA-internal system to approve it.

PR Guidelines

• Include any change that might be observable by our partners or affect their deployment in the release notes.
• Specify fixed issues with Fixes #n, and mention issues worked on using #n
• Include a screenshot for frontend-related PRs - see README or use your favorite screenshot tool

Merge Guidelines

• Make the git commit message look sensible when squash-merging on GitHub (most likely: just copy your PR description).

[Copilot]

Pull Request Overview

This PR refactors the operator termination and workspace deletion grace period settings by replacing hard-coded numeric values with a shared constant, PulumiOperatorGracePeriod, to support future updates and improve consistency.

• Replaces direct 1800-second values in operator and stack configuration with PulumiOperatorGracePeriod.
• Updates expected JSON outputs accordingly, ensuring consistency across workspace and deployment configurations.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
cluster/pulumi/operator/src/operator.ts	Replaces literal terminationGracePeriodSeconds value with PulumiOperatorGracePeriod for the operator release.
cluster/pulumi/common/src/operator/stack.ts	Introduces PulumiOperatorGracePeriod for both deletionGracePeriodSeconds and terminationGracePeriodSeconds in the stack manifest.
cluster/pulumi/common/src/operator/config.ts	Defines the PulumiOperatorGracePeriod constant, centralizing the grace period configuration.
cluster/expected/operator/expected.json	Updates expected values for deletion and termination grace periods.
cluster/expected/deployment/expected.json	Updates expected values for deletion and termination grace periods in deployments.

Comments suppressed due to low confidence (2)

cluster/pulumi/common/src/operator/config.ts:22

• Consider adding an inline comment explaining the purpose of PulumiOperatorGracePeriod and the rationale behind the 1800-second value to aid future maintainers.

export const PulumiOperatorGracePeriod = 1800;

cluster/pulumi/common/src/operator/stack.ts:363

• Verify that using the same PulumiOperatorGracePeriod for both deletionGracePeriodSeconds and terminationGracePeriodSeconds aligns with the intended behavior and document any differences between these settings if necessary.

              deletionGracePeriodSeconds: PulumiOperatorGracePeriod,