debug: add an option to force the use of cached http responses

[radoering]

I am not completely sure if it makes sense to commit this or if there is a better solution but I think it is useful when conducting performance comparisons.

A cache that becomes stale during performance measurements can skew the results. This PR introduces a POETRY_FORCE_HTTP_CACHE environment variable that forces using the cache even if it is stale. At first, I thought there is no need to document this but since it is useful for contributors I added it to contributing.md.

[sourcery-ai]

Hey - I've left some high level feedback:

• Consider avoiding reading POETRY_FORCE_HTTP_CACHE at import time in constants.py and instead evaluating it where the session/adapter is created, so that tests and long-lived processes can toggle the environment variable without needing to reload the module.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider avoiding reading `POETRY_FORCE_HTTP_CACHE` at import time in `constants.py` and instead evaluating it where the session/adapter is created, so that tests and long-lived processes can toggle the environment variable without needing to reload the module.

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