scouting: Deduplicate action definitions in entry.component.ts

I found it tedious to keep the definitions up-to-date between the .fbs
file and the entry.component.ts file. This patch fixes the issue by
using the generated flatbuffer types everywhere.

I added a helper library to deal with `actionTakenType` properly.
Otherwise the user would have to deal with it manually.

Since Angular templates don't seem to allow manual type casting, I
created a pipe to do it for me.

Signed-off-by: Philipp Schrader <philipp.schrader@gmail.com>
Change-Id: I5f60e2d7b89978f40b5758bb8d04e800d6de230d
diff --git a/tools/build_rules/js.bzl b/tools/build_rules/js.bzl
index b735802..bb15c2c 100644
--- a/tools/build_rules/js.bzl
+++ b/tools/build_rules/js.bzl
@@ -252,6 +252,7 @@
     srcs = native.glob(
         ["**/*.ts", "**/*.css", "**/*.html"],
         exclude = test_spec_srcs + [
+            "**/*.jinja2.*",
             "public-api.ts",
         ],
     ) + extra_srcs