t1900: rename t1900-repo to t1900-repo-info

Since the commit bbb2b93348 (builtin/repo: introduce structure subcommand,
2025-10-21), t1901 specifically tests git-repo-structure. Rename
t1900-repo to t1900-repo-info to clarify that it focus solely on
git-repo-info subcommand.

Signed-off-by: Lucas Seiki Oshiro <lucasseikioshiro@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/meson.build

@@ -240,7 +240,7 @@ integration_tests = [
   't1700-split-index.sh',
   't1701-racy-split-index.sh',
   't1800-hook.sh',
-  't1900-repo.sh',
+  't1900-repo-info.sh',
   't1901-repo-structure.sh',
   't2000-conflict-when-checking-files-out.sh',
   't2002-checkout-cache-u.sh',