Clean up sub-project references for monorepo

Remove pkg/linuxptp-daemon/.github/ and pkg/cloud-event-proxy/.github/
(standalone CI replaced by monorepo workflows).
Fix deprecated golangci-lint config properties (deadline, skip-dirs, format).
Update OLM CSV metadata URLs to point at redhat-cne/downstream-ptp-operator-monorepo.

Author: edcdavid

pkg/cloud-event-proxy/.golangci.yaml

@@ -1,18 +1,19 @@
 run:
   concurrency: 8
-  deadline: 3m
+  timeout: 3m
   issues-exit-code: 1
-  tests: true
-  skip-dirs:
-    - vendor
-  skip-dirs-use-default: false
+  tests: true  skip-dirs-use-default: false
 
 
 output:
-  format: colored-line-number
+  formats:
+    - format: colored-line-number
   print-issued-lines: true
   print-linter-name: true
 issues:
+  exclude-dirs:
+    - vendor
+  exclude-dirs-use-default: false
   exclude-use-default: false
   exclude:
     - 'ST1000: at least one file in a package should have a package comment'