refactor: Remove Common Component and Copy Shared Code into Relevant …

[yehudit1987]

…Components

• Delete common component (OWNERS, go.mod, reconcilehelper/)
• Copy reconcilehelper/util.go to both notebook-controller and tensorboard-controller
• Update imports in both controllers to use local reconcilehelper
• Remove common dependency from go.mod files
• Update Dockerfiles to remove common component references

Fix issue: #700

[google-oss-prow]

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[andyatmiami]

/ok-to-test

[andyatmiami]

/lgtm

confirmed the reconcilehelper util.go file that has been duplicated in NBC and TBC exactly matches the original common util.go

MD5 (/tmp/original_util.go) = 338cebd04529f59feae5f02bc7997e23
MD5 (components/notebook-controller/reconcilehelper/util.go) = 338cebd04529f59feae5f02bc7997e23
MD5 (components/tensorboard-controller/reconcilehelper/util.go) = 338cebd04529f59feae5f02bc7997e23