fix: correct default healthcheck probe logic and enable probes by default

[AdheipSingh]

Fixes #XXXX.

Description

Summary

• Fix inverted inequality checks in setDefaultProbe that incorrectly applied readiness paths to startup probes
• Replace != conditions with explicit equality checks using probe type constants
• Change DefaultProbes from bool to *bool — nil (field omitted) defaults to true, explicit false preserved for backward compatibility

Test plan

• Verified historical probes: liveness /status/health, readiness /druid/historical/v1/readiness, startup /druid/historical/v1/readiness
• Verified broker probes: liveness /status/health, readiness /druid/broker/v1/readiness, startup /druid/broker/v1/readiness
• Verified defaultProbes: false removes all default probes (backward compat)
• Verified defaultProbes: true restores all default probes

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This PR has:

• been tested on a real K8S cluster to ensure creation of a brand new Druid cluster works.
• been tested for backward compatibility on a real K*S cluster by applying the changes introduced here on an existing Druid cluster. If there are any backward incompatible changes then they have been noted in the PR description.
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added documentation for new or modified features or behaviors.

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Key changed/added files in this PR

• MyFoo
• OurBar
• TheirBaz

[pjain1]

Codex review

  1. Medium - apis/druid/v1alpha1/druid_types.go:276: DefaultProbes changed to *bool, but generated artifacts are not updated. make generate adds the missing deep-copy block for the bool pointer; without it, DruidSpec.DeepCopy() aliases the pointer instead of copying it. make
     manifests also changes config/crd/... and chart/crds/..., and make api-docs updates the API docs.
  2. Medium - apis/druid/v1alpha1/druid_types.go:273: the field comment says DefaultProbes defaults to true, but the PR removes +kubebuilder:default:=true. Once manifests are regenerated, the CRD no longer advertises or applies that default. I’d keep the CRD default marker on the
     *bool field and still keep the nil check in the controller for in-memory/un-defaulted objects.