Build mandoline:all on 'Linux Tests [(dbg)(1)]'.

These were built on the CQ until some bots were removed:
  'linux_chromium_gn_dbg' and 'linux_chromium_gn_rel'

Get these targets building on the new CQ bots (afaict):
  'linux_chromium_rel_ng' and 'linux_chromium_dbg_ng'
Also build mandoline:all (in addition to mandoline:tests) on:
  'Linux Tests' and 'Linux Tests (dbg)(1)'

Some targets not compatible w/component builds are excluded on dbg.

BUG=478244
TEST=CQ and Main Linux bots described above build mandoline:all.
R=dpranke@chromium.org

Review URL: https://codereview.chromium.org/1381263003

Cr-Commit-Position: refs/heads/master@{#352203}

testing/buildbot/chromium.linux.json

@@ -656,7 +656,8 @@
   },
   "Linux Tests": {
     "additional_compile_targets": [
-      "blimp_tests"
+      "blimp_tests",
+      "mandoline:all"
     ],
     "gtest_tests": [
       {
@@ -1048,7 +1049,8 @@
   },
   "Linux Tests (dbg)(1)": {
     "additional_compile_targets": [
-      "blimp_tests"
+      "blimp_tests",
+      "mandoline:all"
     ],
     "gtest_tests": [
       {