ci: fix codegen

[pmalek]

Summary

Fix code generation and add it to CI.

Without this change we get:

make update-codegen ; make verify-codegen
./scripts/update-deepcopy-gen.sh
unknown flag: --input-dirs
Usage of deepcopy-gen:
      --add_dir_header                   If true, adds the file directory to the header of the log messages
      --alsologtostderr                  log to standard error as well as files (no effect when -logtostderr=true)
      --bounding-dirs strings            Comma-separated list of import paths which bound the types for which deep-copies will be generated.
      --go-header-file string            the path to a file containing boilerplate header text; the string "YEAR" will be replaced with the current 4-digit year
      --log_backtrace_at traceLocation   when logging hits line file:N, emit a stack trace (default :0)
      --log_dir string                   If non-empty, write log files in this directory (no effect when -logtostderr=true)
      --log_file string                  If non-empty, use this log file (no effect when -logtostderr=true)
      --log_file_max_size uint           Defines the maximum size a log file can grow to (no effect when -logtostderr=true). Unit is megabytes. If the value is 0, the maximum file size is unlimited. (default 1800)
      --logtostderr                      log to standard error instead of files (default true)
      --one_output                       If true, only write logs to their native severity level (vs also writing to each lower severity level; no effect when -logtostderr=true)
      --output-file string               the name of the file to be generated (default "generated.deepcopy.go")
      --skip_headers                     If true, avoid header prefixes in the log messages
      --skip_log_headers                 If true, avoid headers when opening log files (no effect when -logtostderr=true)
      --stderrthreshold severity         logs at or above this threshold go to stderr when writing to files and stderr (no effect when -logtostderr=true or -alsologtostderr=true) (default 2)
  -v, --v Level                          number for the log level verbosity
      --vmodule moduleSpec               comma-separated list of pattern=N settings for file-filtered logging
unknown flag: --input-dirs
make: *** [Makefile:19: update-codegen] Error 2
./scripts/verify-codegen.sh
cp: file/kong_json_schema.json: No such file or directory
make: *** [Makefile:14: verify-codegen] Error 1

Full changelog

• [Implement ...]
• [Fix ...]

Issues resolved

Fix #XXX

Documentation

• Link to the website documentation PR

Testing

• Unit tests
• E2E tests
• Manual testing on Universal
• Manual testing on Kubernetes

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.71%. Comparing base (2b9555f) to head (be40da6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #148   +/-   ##
=======================================
  Coverage   28.71%   28.71%           
=======================================
  Files         106      106           
  Lines       15817    15817           
=======================================
  Hits         4542     4542           
  Misses      10796    10796           
  Partials      479      479           

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