Increase per-step timeout for build_android_host_app_with_module_source targets (#171241)

These targets have a 60m overall timeout, but a per step timeout of 30m.
Almost all of the time is spent in one of the steps, see

https://ci.chromium.org/ui/p/flutter/builders/prod/Windows%20build_android_host_app_with_module_source/3321/overview

Increase the per-step timeout to 45, as it is doing a lot of work and
does occasionally hit the 30m timeout.

Fixes https://github.com/flutter/flutter/issues/170788 for now (in that
it will get it below flake threshold).

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we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

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---------

Co-authored-by: Gray Mackall <mackall@google.com>

.ci.yaml

@@ -1049,6 +1049,7 @@ targets:
       tags: >
         ["devicelab", "hostonly", "linux"]
       task_name: build_android_host_app_with_module_source
+      test_timeout_secs: "2700"
     runIf:
       - dev/**
       - packages/flutter_tools/**
@@ -4292,6 +4293,7 @@ targets:
       tags: >
         ["devicelab", "hostonly", "mac"]
       task_name: build_android_host_app_with_module_source
+      test_timeout_secs: "2700"
     runIf:
       - dev/**
       - packages/flutter_tools/**
@@ -6120,6 +6122,7 @@ targets:
       tags: >
         ["devicelab", "hostonly", "windows"]
       task_name: build_android_host_app_with_module_source
+      test_timeout_secs: "2700"
     runIf:
       - dev/**
       - packages/flutter_tools/**