fix(python): install workspace prerequisites before instrumentors

[mikeldking]

Closes #3743.

Install checked-out semantic conventions and core instrumentation as bookends around leaf-specific setup in tox commands_pre:

1. before leaf installation, so new internal minimums resolve from the checkout while UV_EXCLUDE_NEWER hides recent PyPI releases;
2. after test/latest dependency changes, so CI tests checked-out source with its declared dependency versions.

Verification:

• py310-ci-agno-latest: 147 tests passed
• py314-ci-mistralai-latest: 25 tests passed
• both previously failing environments resolve local openinference-instrumentation==0.1.63.

[github-actions]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

[github-actions]

The trailing unconditional reinstall clobbers the [test] extras for the instrumentation environment.

In the new ordering, the execution sequence for the instrumentation tox environment is:

1. Line ~107: uv pip install --reinstall {toxinidir}/openinference-instrumentation (unconditional — no extras)
2. Line ~256: instrumentation: uv pip install --reinstall {toxinidir}/openinference-instrumentation[test] (factor-gated — installs [test] extras ✓)
3. Line 300: uv pip install --reinstall {toxinidir}/openinference-instrumentation (unconditional — overwrites without [test] extras ✗)

In the original code, the two unconditional installs were in the middle of commands_pre, so the factor-gated [test] install at line 256 came last and won. Now they're bookends, and the trailing unconditional (line 300) runs after the [test] install, stripping the extras.

Fix: add a factor-gated reinstall after the unconditional trailing line so the instrumentation environment ends up with [test] extras:

Suggested change

	uv pip install --reinstall {toxinidir}/openinference-semantic-conventions
	uv pip install --reinstall {toxinidir}/openinference-instrumentation
	uv pip install --reinstall {toxinidir}/openinference-semantic-conventions
	uv pip install --reinstall {toxinidir}/openinference-instrumentation
	instrumentation: uv pip install --reinstall {toxinidir}/openinference-instrumentation[test]