[Application] Add missing (un)staking events

[bryanchriswhite]

Summary

Adds:

• EventApplicationStake
• EventApplicationUnbondingBegin
• EventApplicationUnbondingEnd
• EventApplicationUnbondingCanceled

Also refactors application min. stake unbonding to re-use existing unbonding period and end-blocker mechanics instead of unbonding immediately.

Issue

• [Events] Add missing events #858

Type of change

Select one or more from the following:

• New feature, functionality or library
• Consensus breaking; add the consensus-breaking label if so. See [Infra] Automatically add the consensus-breaking label #791 for details
• Bug fix
• Code health or cleanup
• Documentation
• Other (specify)

Testing

• Documentation: make docusaurus_start; only needed if you make doc changes
• Unit Tests: make go_develop_and_test
• LocalNet E2E Tests: make test_e2e
• DevNet E2E Tests: Add the devnet-test-e2e label to the PR.

Sanity Checklist

• I have tested my changes using the available tooling
• I have commented my code
• I have performed a self-review of my own code; both comments & source code
• I create and reference any new tickets, if applicable
• I have left TODOs throughout the codebase, if applicable

[github-actions]

The image is going to be pushed after the next commit.

You can use make trigger_ci to push an empty commit.

If you also want to run E2E tests, please add devnet-test-e2e label.

[github-actions]

The CI will now also run the e2e tests on devnet, which increases the time it takes to complete all CI checks.

You may need to run make trigger_ci to submit an empty commit that'll trigger the tests.

GCP workloads (requires changing the namespace to 867)
Grafana network dashboard for devnet-issue-867