chore: move event reasons to the package and as constants

[flavono123]

Fixes #1897

Description

1. converts string literals as reasons of event to constant
2. pull up them to the package events

• i think events is enough over apis or under that

How was this change tested?

• test or e2etest not yet, cannot run tests and more details would be written in a thread.
• when finding double quoted strings, they are only exist in the events package.
  • except, "InsufficientCapacityError" which also is in cloudprovider/metrics package.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[flavono123]

when i tried a local test with the package i fixed, seems some settings are required concerned with kubebuilder, but it is not covered in any docs or different with a normal kubebuilder installation. how can i test in my local?:

❯ go test ./pkg/controllers/disruption/
Running Suite: Disruption - /Users/hansuk.hong/T/karpenter/pkg/controllers/disruption
=====================================================================================
Random Seed: 1736918483

Will run 175 of 175 specs
------------------------------
[BeforeSuite] [PANICKED] [0.015 seconds]
[BeforeSuite] 
/Users/hansuk.hong/T/karpenter/pkg/controllers/disruption/suite_test.go:90

  [PANICKED] Test Panicked
  In [BeforeSuite] at: /Users/hansuk.hong/go/1.23.4/pkg/mod/github.com/samber/[email protected]/errors.go:53 @ 01/15/25 14:21:24.002

  unable to start control plane itself: failed to start the controlplane. retried 5 times: fork/exec /usr/local/kubebuilder/bin/etcd: no such file or directory

  Full Stack Trace
    github.com/samber/lo.must({0x1027b2be0, 0x140000ca340}, {0x0, 0x0, 0x0})
        /Users/hansuk.hong/go/1.23.4/pkg/mod/github.com/samber/[email protected]/errors.go:53 +0x1cc
    github.com/samber/lo.Must[...](...)
        /Users/hansuk.hong/go/1.23.4/pkg/mod/github.com/samber/[email protected]/errors.go:65
    sigs.k8s.io/karpenter/pkg/test.NewEnvironment({0x140002f7748?, 0x0?, 0x0?})
        /Users/hansuk.hong/T/karpenter/pkg/test/environment.go:133 +0x304
    sigs.k8s.io/karpenter/pkg/controllers/disruption_test.init.func4()
        /Users/hansuk.hong/T/karpenter/pkg/controllers/disruption/suite_test.go:91 +0xa8
------------------------------
[AfterSuite] [PANICKED] [0.000 seconds]
[AfterSuite] 
/Users/hansuk.hong/T/karpenter/pkg/controllers/disruption/suite_test.go:104

  [PANICKED] Test Panicked
  In [AfterSuite] at: /Users/hansuk.hong/.goenv/versions/1.23.4/src/runtime/panic.go:262 @ 01/15/25 14:21:24.002

  runtime error: invalid memory address or nil pointer dereference

  Full Stack Trace
    sigs.k8s.io/karpenter/pkg/test.(*Environment).Stop(0x0)
        /Users/hansuk.hong/T/karpenter/pkg/test/environment.go:169 +0x1c
    sigs.k8s.io/karpenter/pkg/controllers/disruption_test.init.func5()
        /Users/hansuk.hong/T/karpenter/pkg/controllers/disruption/suite_test.go:105 +0x24
------------------------------

Summarizing 2 Failures:
  [PANICKED!] [BeforeSuite] 
  /Users/hansuk.hong/go/1.23.4/pkg/mod/github.com/samber/[email protected]/errors.go:53
  [PANICKED!] [AfterSuite] 
  /Users/hansuk.hong/.goenv/versions/1.23.4/src/runtime/panic.go:262

Ran 0 of 175 Specs in 0.015 seconds
FAIL! -- A BeforeSuite node failed so all tests were skipped.
--- FAIL: TestAPIs (0.02s)
FAIL
FAIL    sigs.k8s.io/karpenter/pkg/controllers/disruption        0.536s
FAIL