Adapt a LUCI builder definition

Before starting the main task, read //docs/infra/new_builder.md.

Create a new builder named win-blink-asan-rel that builds and runs web tests on Windows with address sanitization enabled. The builder should be closely modeled on linux-blink-asan-rel.

Builder requirements:

• The builder should have a try version that mirrors its CI counterpart.
• The builder should build and test with standard Windows x86_64 GCE machines.
• In CI, the builder should belong to the chromium.memory builder group, with win|blink as the category in the LUCI console.
• Find suitable existing .star files to reuse instead of creating new .star files.
• Copy the contact email for linux-blink-asan-rel to the new builder.

Other instructions:

• All relevant .star files to modify are under //infra/config/.
• Once the .star changes have been written, remember to run lucicfg generate main.star from //infra/config/ to generate files for LUCI to consume.
• Don't stage or commit any files.