Deprecate is_write_action and write_permission=True when login

[Wauplin]

(slightly related to #2631)

This PR takes care of removing any local checks related to tokens. Since finegrained and oauth tokens exist, we don't have a simple distinction between "read" and "write" permission, making a few features useless and outdated in the codebase.

This PR:

1. deprecates is_write_action in build_hf_headers

=> this argument has close to no usage at all and complexifies the API for nothing. Its first purpose in #1064 was to raise an exception if a local token was not find and the HTTP call specifically needed a token (what I wrongly called "a write action" instead of "an authenticated action"). In the end it's much simpler if we let the server raise the exception when appropriate.
For context, before #1064, we had a distinction between "write actions" and "not write actions" in the sense that only "write actions" was using a token. All read actions where unauthenticated (even if a token was locally saved) which caused troubles when stable diffusion was released as a gated repo where even a read needed authentication. Since then, the locally saved token is always sent to the server if it exists.

2. deprecates write_permission in login / notebook_login / interpreter_login helpers

=> with finegrained tokens, it doesn't make sense anymore to require a "write" token. Added in #1476.

3. deprecates positional args in login / notebook_login / interpreter_login helpers

=> otherwise we won't be able to remove them. Always better to enforce keyword arguments for future maintenance.

[HuggingFaceDocBuilderDev]

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[hanouticelina]

lgtm, thanks @Wauplin!

[LysandreJik]

Yes, the change sounds good to me. Thanks @Wauplin!

[Wauplin]

Thanks for the reviews! I fixed a few mypy errors so we should be good to merge :)