Support all glob wildcard characters in namespace validation (#9502)

* Support all glob wildcard characters in namespace validation

Expand namespace validation to allow all valid glob pattern characters
(*, ?, {}, [], ,) by replacing them with valid characters during RFC 1123
validation. The actual glob pattern validation is handled separately by
the wildcard package.

Also add validation to reject unsupported characters (|, (), !) that are
not valid in glob patterns, and update terminology from "regex" to "glob"
for clarity since this implementation uses glob patterns, not regex.

Changes:
- Replace all glob wildcard characters in validateNamespaceName
- Add test coverage for valid glob patterns in includes/excludes
- Add test coverage for unsupported characters
- Reject exclamation mark (!) in wildcard patterns
- Clarify comments and error messages about glob vs regex

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Signed-off-by: Joseph <jvaikath@redhat.com>

* Changelog

Signed-off-by: Joseph <jvaikath@redhat.com>

* Add documentation: glob patterns are now accepted

Signed-off-by: Joseph <jvaikath@redhat.com>

* Error message fix

Signed-off-by: Joseph <jvaikath@redhat.com>

* Remove negation glob char test

Signed-off-by: Joseph <jvaikath@redhat.com>

* Add bracket pattern validation for namespace glob patterns

Extends wildcard validation to support square bracket patterns [] used in glob character classes. Validates bracket syntax including empty brackets, unclosed brackets, and unmatched brackets. Extracts ValidateNamespaceName as a public function to enable reuse in namespace validation logic.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Signed-off-by: Joseph <jvaikath@redhat.com>

* Reduce scope to *, ?, [ and ]

Signed-off-by: Joseph <jvaikath@redhat.com>

* Fix tests

Signed-off-by: Joseph <jvaikath@redhat.com>

* Add namespace glob patterns documentation page

Adds dedicated documentation explaining supported glob patterns
for namespace include/exclude filtering to help users understand
the wildcard syntax.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Signed-off-by: Joseph <jvaikath@redhat.com>

* Fix build-image Dockerfile envtest download

Replace inaccessible go.kubebuilder.io URL with setup-envtest and update envtest version to 1.33.0 to match Kubernetes v0.33.3 dependencies.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Signed-off-by: Joseph <jvaikath@redhat.com>

* kubebuilder binaries mv

Signed-off-by: Joseph <jvaikath@redhat.com>

* Reject brace patterns and update documentation

Add {, }, and , to unsupported characters list to explicitly reject
brace expansion patterns. Remove { from wildcard detection since these
patterns are not supported in the 1.18 release.

Update all documentation to show supported patterns inline (*, ?, [abc])
with clickable links to the detailed namespace-glob-patterns page.
Simplify YAML comments by removing non-clickable URLs.

Update tests to expect errors when brace patterns are used.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Signed-off-by: Joseph <jvaikath@redhat.com>

* Document brace expansion as unsupported

Add {} and , to the unsupported patterns section to clarify that
brace expansion patterns like {a,b,c} are not supported.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Signed-off-by: Joseph <jvaikath@redhat.com>

* Update tests to expect brace pattern rejection

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Signed-off-by: Joseph <jvaikath@redhat.com>

---------

Signed-off-by: Joseph <jvaikath@redhat.com>
Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

hack/build-image/Dockerfile

@@ -21,9 +21,11 @@ ENV GO111MODULE=on
 ENV GOPROXY=${GOPROXY}
 
 # kubebuilder test bundle is separated from kubebuilder. Need to setup it for CI test.
-RUN curl -sSLo envtest-bins.tar.gz https://go.kubebuilder.io/test-tools/1.22.1/linux/$(go env GOARCH) && \
-    mkdir /usr/local/kubebuilder && \
-    tar -C /usr/local/kubebuilder --strip-components=1 -zvxf envtest-bins.tar.gz
+# Using setup-envtest to download envtest binaries
+RUN go install sigs.k8s.io/controller-runtime/tools/setup-envtest@latest && \
+    mkdir -p /usr/local/kubebuilder/bin && \
+    ENVTEST_ASSETS_DIR=$(setup-envtest use 1.33.0 --bin-dir /usr/local/kubebuilder/bin -p path) && \
+    cp -r ${ENVTEST_ASSETS_DIR}/* /usr/local/kubebuilder/bin/
 
 RUN wget --quiet https://github.com/kubernetes-sigs/kubebuilder/releases/download/v3.2.0/kubebuilder_linux_$(go env GOARCH) && \
     mv kubebuilder_linux_$(go env GOARCH) /usr/local/kubebuilder/bin/kubebuilder && \