feat: add API types for ExternalSecretsConfig component overrides (EP-1898)

[swghosh]

Summary

• Extends ExternalSecretsConfig API with annotations field for global custom annotations on all operand Deployments and Pod templates
• Adds componentConfigs field for per-component configuration overrides (Controller, Webhook, CertController, BitwardenSDKServer)
• Introduces DeploymentConfig type with revisionHistoryLimit and overrideEnv for custom environment variables per component
• Includes CEL validation rules for reserved annotation prefixes and reserved environment variable name prefixes
• Adds comprehensive integration test suite with 30+ new test cases covering create, update, and validation scenarios

Enhancement Proposal

openshift/enhancements#1898

Changes

File	Description
api/v1alpha1/meta.go	Added KVPair and Annotation types
api/v1alpha1/external_secrets_config_types.go	Added ComponentConfig, DeploymentConfig types; extended ControllerConfig with annotations and componentConfigs fields; extended ComponentName enum with Webhook and CertController
api/v1alpha1/zz_generated.deepcopy.go	Auto-generated deepcopy functions for new types
config/crd/bases/operator.openshift.io_externalsecretsconfigs.yaml	Regenerated CRD manifest with new fields
api/v1alpha1/tests/.../externalsecretsconfig.testsuite.yaml	30+ new integration tests

Test plan

• All new fields have valid-value creation tests
• All validation rules (enums, min/max, reserved prefixes, uniqueness) have error-case tests
• Update scenarios tested for annotations, componentConfigs, overrideEnv, and revisionHistoryLimit
• make generate and make manifests pass successfully
• go vet ./api/... passes with no issues

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: swghosh

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