redaction_tool: Change the brackets used for redacted information

Redacting information with <> potentially leads some tools to treat it
as HTML tags and removing them for sanitization.

Bug: b:278189152
Change-Id: I82cd2b352449d073480b1628a450b484dd5369bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4420873
Auto-Submit: Christoph Schlosser <cschlosser@chromium.org>
Commit-Queue: Christoph Schlosser <cschlosser@chromium.org>
Reviewed-by: Irem Uguz <iremuguz@google.com>
Code-Coverage: Findit <findit-for-me@appspot.gserviceaccount.com>
Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Reviewed-by: Ian Barkley-Yeung <iby@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1135073}
NOKEYCHECK=True
GitOrigin-RevId: 9e179811cd6f2272eb822382a65160d7eb6b5790
2 files changed