Update remote-execution-caching-debug.md

[ecngtng]

1. When '--execution_log_json_file' is used, we don't need to download code and use execution log parser to convert the logs to
   text anymore. We could directly use our favourite text differ to diff.
   This option is more convenient than '--execution_log_binary_file'.

2. Add information about 'internal' and update example with that.

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[ulrfa]

Note that this PR resolves: #8359

[brentleyjones]

By using src/tools/execlog:parser, the order of the actions are synced. Is the json output ordered in a way that diffing is easy, or does it need to be post-processed?

[ulrfa]

By using src/tools/execlog:parser, the order of the actions are synced. Is the json output ordered in a way that diffing is easy, or does it need to be post-processed?

The json file produced by --execution_log_json_file is sorted, so no post-processing is needed before textual comparison.