Make auto instrumentation use the same dependency resolver as manual instrumentation does

[rjduffner]

Description

In order for the auto instrumentation to use the same dependency checker as the instrumentation itself, I introduce an exception that allows for an early exit from instrument function through the distro and back to the _load.

Fixes #3201

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• Updated existing tests to handle the case of the new dependency check
• Added a new test to make sure that when a dependency conflict gets returned to the instrument function, it raises an exception.

Does This PR Require a Core Repo Change?

• No.

Checklist:

See contributing.md for styleguide, changelog guidelines, and more.

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added

[rjduffner]

@xrmx, Here is an option for making the auto instrumentation use the same dependency checker as the manual instrumentation.

There are a few rough edges but I think ironing those out gets us down a path of a major rewrite pretty quickly so maybe this little PR could work.

[xrmx]

Any reason why you are removing this cache? I'm not sure this cache really helps with anything :)

[rjduffner]

When I removed line 103 below, I couldn't find any other usages of this class so I removed this class just to keep things tidy.

If I missed a usage or a use case somewhere I am happy to re-add it. I just pulled it since my code search told me it was dead code.

[rjduffner]

I actually think get_dist_dependency_conflicts is now unused too

> ag get_dist_dependency_conflicts
opentelemetry-instrumentation/tests/test_dependencies.py
23:    get_dist_dependency_conflicts,
68:    def test_get_dist_dependency_conflicts(self):
82:        conflict = get_dist_dependency_conflicts(dist)
90:    def test_get_dist_dependency_conflicts_requires_none(self):
103:        conflict = get_dist_dependency_conflicts(dist)

opentelemetry-instrumentation/src/opentelemetry/instrumentation/dependencies.py
51:def get_dist_dependency_conflicts(

CHANGELOG.md
64:- `opentelemetry-instrumentation` Fix `get_dist_dependency_conflicts` if no distribution requires