Ignore a few paths for tools/bisect

These paths are generated when running the tool.

Bug: b/331228820
Change-Id: I8e709cc0c779d3deefca3960238574a3e05129a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5518680
Commit-Queue: Kuan Huang <kuanhuang@chromium.org>
Auto-Submit: Sven Zheng <svenzheng@chromium.org>
Reviewed-by: Kuan Huang <kuanhuang@chromium.org>
Commit-Queue: Sven Zheng <svenzheng@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1296987}

.gitignore

@@ -266,6 +266,8 @@ vs-chromium-project.txt
 /testing/location_tags.json
 /testing/rts/
 /testserver.log
+/tools/bisect/.bisect-builds-cache.json
+/tools/bisect/catapult_bisect_dep/
 # See third_party/.gitignore for entries covering src/third_party.
 /tools/.bisect-builds-cache.json
 /tools/cygprofile/*.wprgo