fix(git): parse SSH config after long lines

Yarra Vivekrequested to merge
vivekyarra567/cli:fix/ssh-config-long-lines into main

Description

Raise the SSH config scanner capacity to 1 MiB so a large configuration line does not discard all aliases that follow it. The regression test places a 70 KiB comment before a valid host alias.

Test plan

  • go test ./internal/git -run '^Test_sshParser_readContinuesAfterLongLine$'n- git diff --checkn Closes #8453 (closed)

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