ci: improve detection of UI changes to save resources

Improve the regex that detects UI-only changes to keep into
account also test rebaselines. Today if you make a UI-only
change and rebaseline the tests, all bots end up doing work
(including the ones that test c++ code)

Change-Id: I3cfd6528452916e7f0705267e2a0579612f7af30

test/ci/common.sh

@@ -37,7 +37,7 @@ rm -rf out/tmp.protoc
 tools/check_sql_modules.py
 tools/check_sql_metrics.py
 
-if !(git diff --name-only HEAD^1 HEAD | egrep -qv '^(ui|docs|infra)/'); then
+if !(git diff --name-only HEAD^1 HEAD | egrep -qv '^(ui|docs|infra|test/data/ui-screenshots)/'); then
 export UI_DOCS_INFRA_ONLY_CHANGE=1
 else
 export UI_DOCS_INFRA_ONLY_CHANGE=0