Use configured env for activation command

[puneetdixit200]

Resolves: #10423

• Added tests for changed code.
• Updated documentation for changed code.

env activate now uses the environment selected during command setup instead of resolving a fresh environment. This preserves the compatible virtualenv chosen when the active Python does not satisfy the project constraint, and avoids looking at the incompatible active VIRTUAL_ENV again.

Tests:

• ./.bootstrap-venv/bin/python -m pytest tests/console/commands/env/test_activate.py -q
• UV_CACHE_DIR=$PWD/.uv-cache uvx ruff==0.15.12 check src/poetry/console/commands/env/activate.py tests/console/commands/env/test_activate.py
• UV_CACHE_DIR=$PWD/.uv-cache uvx ruff==0.15.12 format --check src/poetry/console/commands/env/activate.py tests/console/commands/env/test_activate.py
• git diff --check

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[puneetdixit200]

Rebased this branch on current main; no code changes beyond the rebase.

Verified:

• python3 -m py_compile src/poetry/console/commands/env/activate.py tests/console/commands/env/test_activate.py
• git diff --check

[puneetdixit200]

Rebased again on current main (448eadfa). No code changes beyond the rebase.

Verified locally:

• python3 -m py_compile src/poetry/console/commands/env/activate.py tests/console/commands/env/test_activate.py
• git diff --check upstream/main...HEAD

[puneetdixit200]

Rebased onto current main; no code changes beyond replaying the existing patch.

New head: 378e64e56275.

Verified locally:

• python3 -m py_compile src/poetry/console/commands/env/activate.py tests/console/commands/env/test_activate.py
• git diff --check upstream/main...HEAD

[puneetdixit200]

Checked the fresh CI after the rebase. The only red job is Windows (Python 3.10) / pytest, failing tests/utils/env/test_env.py::test_call_does_not_block_on_full_pipe[sys.stderr]; the status job is just aggregating that failure.

That test is outside this PR's diff (src/poetry/console/commands/env/activate.py and tests/console/commands/env/test_activate.py). I tried to rerun failed jobs, but GitHub rejected it with Must have admin rights to Repository, so I cannot trigger the rerun from here.

[puneetdixit200]

Rebased onto current main; no code changes beyond replaying the existing env activation patch.

New head: c579549ece7d.

Verified locally:

• .venv/bin/python -m pytest tests/console/commands/env/test_activate.py -q (12 passed, 3 skipped)
• .venv/bin/python -m pytest tests/utils/env/test_env.py::test_call_does_not_block_on_full_pipe -q (2 passed)
• .venv/bin/python -m py_compile src/poetry/console/commands/env/activate.py tests/console/commands/env/test_activate.py
• git diff --check upstream/main...HEAD

[puneetdixit200]

Fresh checks on c579549ece7d are green now. The Tests workflow completed successfully: 48 passed checks and 4 expected skipped checks.