node_tests: Refresh templates.js import for every test.
node_tests: Refresh templates.js import for every test.

Translation handlebars helpers were not getting changed when we
mock static/js/i18n.ts and then unmock it in a different test.

We mock i18n.ts for every test except node_tests/i18n.js.
So, running any code that calls the registered handlebar
helpers related to translations before running i18n test
will run the helper functions registered with mocked i18n module.
The subsequent tests too would use those functions registered
with mocked i18n module.

This causes the i18n test to fail as we expect the registered
helpers to use actual i18n.ts instead of a mock if we have
code that would call the registered translation helpers in
tests that run before i18n.

zulip/zulip,zulip/zulip,kou/zulip,andersk/zulip,andersk/zulip,eeshangarg/zulip,rht/zulip,zulip/zulip,kou/zulip,eeshangarg/zulip,andersk/zulip,eeshangarg/zulip,eeshangarg/zulip,eeshangarg/zulip,rht/zulip,kou/zulip,andersk/zulip,kou/zulip,rht/zulip,rht/zulip,andersk/zulip,eeshangarg/zulip,rht/zulip,rht/zulip,andersk/zulip,zulip/zulip,kou/zulip,andersk/zulip,eeshangarg/zulip,kou/zulip,zulip/zulip,zulip/zulip,rht/zulip,zulip/zulip,kou/zulip