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http-fetch: add --stdout for direct packfile fetches#2263

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friel-openai:pando/http-fetch-stdout
Open

http-fetch: add --stdout for direct packfile fetches#2263
friel-openai wants to merge 1 commit intogit:masterfrom
friel-openai:pando/http-fetch-stdout

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@friel-openai
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git http-fetch --packfile=<hash> currently downloads the HTTP response
into a temporary file and then runs index-pack on that file after the
transfer completes.

That is fine for the existing packfile-URI client, but it prevents callers
from streaming pack bytes into index-pack --stdin and overlapping network
receive with indexing.

Add an internal-use --stdout mode for --packfile=<hash> that writes the
packfile bytes directly to standard output and skips the temporary-file plus
post-download index-pack step. The existing behavior remains unchanged
unless --stdout is specified.

This is intended as plumbing for fetch-pack packfile-URI pipelining in a
follow-up change.

`git http-fetch --packfile=<hash>` downloads the packfile into a
temporary file and then runs `index-pack` after the transfer finishes.
That makes it impossible for callers to stream the pack bytes into
`index-pack --stdin` and overlap download with indexing.

Add an internal-use `--stdout` mode for `--packfile=<hash>` that writes
the packfile contents to standard output and skips the temporary-file
`index-pack` step. Keep the existing behavior unchanged unless the new
mode is requested, and reject `--stdout` in combinations that do not use
`--packfile=<hash>` or that also pass `--index-pack-arg`.

Signed-off-by: Friel <friel@openai.com>
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