[bug] conan profile show crashes when requesting json output if profile contains a reference.

[Adnn]

Environment details

• Operating System+version: macOS 12.6
• Conan version: 2.0.14
• Python version: 3.11.4

Steps to reproduce

Issuing conan profile show -pr:h ourprofile, we get:

[settings]
arch=x86_64
...
os.version=10.13
[tool_requires]
*: cmake/3.27.7
[conf]
tools.apple:enable_visibility=False

Yet, if we request the output as Json format (in order to be able to parse to output with jq, as advised here), conan crashes with:

ERROR: Object of type RecipeReference is not JSON serializable

If we remove the tool_requires section of our profile, the json output works as expected.

Logs

ERROR: Traceback (most recent call last):
File "/Users/someguy/MigrationConan2/env/lib/python3.11/site-packages/conan/cli/cli.py", line 272, in main
cli.run(args)
File "/Users/someguy/MigrationConan2/env/lib/python3.11/site-packages/conan/cli/cli.py", line 172, in run
command.run(self._conan_api, args[0][1:])
File "/Users/someguy/MigrationConan2/env/lib/python3.11/site-packages/conan/cli/command.py", line 141, in run
sub.run(conan_api, parser, *args)
File "/Users/someguy/MigrationConan2/env/lib/python3.11/site-packages/conan/cli/command.py", line 157, in run
self._format(parent_parser, info, *args)
File "/Users/someguy/MigrationConan2/env/lib/python3.11/site-packages/conan/cli/command.py", line 94, in _format
formatter(info)
File "/Users/someguy/MigrationConan2/env/lib/python3.11/site-packages/conan/cli/commands/profile.py", line 30, in json_profiles
cli_out_write(json.dumps(result))
^^^^^^^^^^^^^^^^^^
File "/usr/local/Cellar/python@3.11/3.11.4_1/Frameworks/Python.framework/Versions/3.11/lib/python3.11/json/init.py", line 231, in dumps
return _default_encoder.encode(obj)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/Cellar/python@3.11/3.11.4_1/Frameworks/Python.framework/Versions/3.11/lib/python3.11/json/encoder.py", line 200, in encode
chunks = self.iterencode(o, _one_shot=True)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/Cellar/python@3.11/3.11.4_1/Frameworks/Python.framework/Versions/3.11/lib/python3.11/json/encoder.py", line 258, in iterencode
return _iterencode(o, 0)
^^^^^^^^^^^^^^^^^
File "/usr/local/Cellar/python@3.11/3.11.4_1/Frameworks/Python.framework/Versions/3.11/lib/python3.11/json/encoder.py", line 180, in default
raise TypeError(f'Object of type {o.class.name} '
TypeError: Object of type RecipeReference is not JSON serializable

[AbrilRBS]

Hi @Adnn thanks a lot for taking the time to report the issue.

I've proposed #15185 to fix it for the next 2.0.15 release, I still need to check with the team about the serialization of the reference itself or whether just outputting the string representation would be enough :)