Fix error messages for unversioned files. version: ... syntax will need fixed up later

[jsuereth]

Fixes unversioned file error messages, versioned files still get horrible results.

Example new (well old, but returned) error message:

Diagnostic report:

invalid_semconv_group

  × Missing required property: "brief".
   ╭─[/home/joshuasuereth/test/bad.yaml:3:5]
 1 │ my_bad_yaml: test
 2 │ groups:
 3 │   - id: test
   ·     ▲
   ·     ╰── somewhere in this block
 4 │     
   ╰────
  help: A group defines an attribute group, an entity, or a signal. Supported group types are: `attribute_group`, `span`, `event`, `metric`, `entity`, `scope`.
        Mandatory fields are: `id` and `brief`.
        
        Note: The `resource` type is no longer used and is an alias for `entity`.


invalid_semconv_group

  × Object contains unexpected properties: my_bad_yaml. These properties are not defined in the schema.
  help: A semantic convention file as defined [here](https://github.com/open-telemetry/build-tools/blob/main/semantic-conventions/syntax.md) A semconv file is a
        collection of semantic convention groups (i.e. [`GroupSpec`]).

However, once you add the version flag, you're back to bad error messages:

$ ../src/open-telemetry/weaver/target/debug/weaver registry check -r $(pwd)
Weaver Registry Check
Checking registry `/home/joshuasuereth/test`
ℹ No registry manifest found: /home/joshuasuereth/test/registry_manifest.yaml

Diagnostic report:

invalid_semconv_group

  × Value {"groups":[{"id":"test"}],"my_bad_yaml":"test","version":"1"} does not match any schema in a 'oneOf' group; it must match exactly one.
  help: A versioned semantic convention file.

or even worse:

$ ../src/open-telemetry/weaver/target/debug/weaver registry check -r $(pwd)
Weaver Registry Check
Checking registry `/home/joshuasuereth/test`
ℹ No registry manifest found: /home/joshuasuereth/test/registry_manifest.yaml

Diagnostic report:

  × data did not match any variant of untagged enum SemConvSpec

Will fix this up as part of V2 schema efforts.

[jerbly]

This makes sense to bring back the prior behaviour. Needs a changelog entry.

[lquerel]

LGTM

[codecov]

Codecov Report

❌ Patch coverage is 70.96774% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.9%. Comparing base (74d649b) to head (7f6aa47).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/weaver_semconv/src/semconv.rs	53.3%	7 Missing ⚠️
crates/weaver_semconv/src/registry.rs	50.0%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #880     +/-   ##
=======================================
+ Coverage   77.7%   77.9%   +0.2%     
=======================================
  Files         76      76             
  Lines       5936    5956     +20     
=======================================
+ Hits        4616    4644     +28     
+ Misses      1320    1312      -8     

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