Fix workflow bundler warn due to non-workflow safe import in user-met…

[mjameswh]

What was changed

• User Metadata (User metadata #1657) introduced an import to Payload Codecs APIs from a file that is imported into the Workflow sandbox.

  This has been adding approx 350 KB to the size of workflow bundles, and causing warning messages from the workflow bundler:

  WARNING in ../common/lib/internal-non-workflow/data-converter-helpers.js 28:17-30
  Critical dependency: the request of a dependency is an expression
      at CommonJsRequireContextDependency.getWarnings (main/node_modules/webpack/lib/dependencies/ContextDependency.js:109:18)
      at Compilation.reportDependencyErrorsAndWarnings (main/node_modules/webpack/lib/Compilation.js:3278:24)
      at main/node_modules/webpack/lib/Compilation.js:2863:28
      at _next2 (eval at create (main/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:16:1)
      at eval (eval at create (main/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:42:1)
      at main/node_modules/webpack/lib/FlagDependencyExportsPlugin.js:395:10
      at main/node_modules/neo-async/async.js:2830:7
      at Object.each (main/node_modules/neo-async/async.js:2850:39)
      at main/node_modules/webpack/lib/FlagDependencyExportsPlugin.js:366:17
      at main/node_modules/neo-async/async.js:2830:7
   @ ../common/lib/internal-non-workflow/index.js 24:13-48
   @ ../common/lib/user-metadata.js 7:32-66
   @ ../workflow/lib/workflow.js 36:24-71
   @ ../workflow/lib/global-overrides.js 14:19-40
   @ ./lib/workflows-autogenerated-entrypoint.cjs 5:28-83