Remove compilation workarounds on XCode 14

What does this merge request do and why?

Since the related upstream fixes have been merged and deployed to the GitLab codebase

• https://github.com/pganalyze/pg_query/pull/256 and gitlab!98274 (merged)
• https://github.com/meinac/oj-introspect/pull/3 and gitlab!103647 (merged)

We can safely remove these workarounds.

How to test this change locally

• We need to run XCode 14 to effectively test this change

  $ clang --version
  Apple clang version 14.0.0 (clang-1400.0.29.202)
  Target: arm64-apple-darwin22.1.0
  Thread model: posix
  InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

• Remove the following entries in the bundle config in /gitlab folder (e.g. gitlab/.bundle/config)

    ---
    BUNDLE_SET: "without production"
    BUNDLE_JOBS: "10"
    BUNDLE_BUILD__PG: "--with-pg-config=/Users/tanle/.asdf/installs/postgres/12.13/bin/pg_config"
    BUNDLE_BUILD__GPGME: "--use-system-libraries"
    BUNDLE_BUILD__RE2: "--with-re2-dir=/opt/homebrew/opt/re2"
    BUNDLE_BUILD__THRIFT: "--with-cppflags=-Wno-error=compound-token-split-by-macro"
  - BUNDLE_BUILD__PG_QUERY: "--with-ldflags=-Wl,-undefined,dynamic_lookup"
    BUNDLE_BUILD__FFI___YAJL: "--with-ldflags=-Wl,-undefined,dynamic_lookup"
  - BUNDLE_BUILD__OJ___INTROSPECT: "--with-ldflags=-Wl,-undefined,dynamic_lookup"

• Uninstall pg-query and ob-introspect

  gem uninstall pg-query ob-introspect

• Re-install pg-query and ob-introspect without ldflags

  bundle install

Impacted categories

The following categories relate to this merge request:

• gdk-reliability - e.g. When a GDK action fails to complete.
• gdk-usability - e.g. Improvements or suggestions around how the GDK functions.
• gdk-performance - e.g. When a GDK action is slow or times out.

Merge request checklist

• This change is backward compatible. If not, please include steps to communicate to our users.
• Tests added for new functionality. If not, please raise an issue to follow-up.
• Documentation added/updated, if needed.
• gdk doctor test added, if needed.
• Add the ~highlight label if this MR should be included in the CHANGELOG.md.