test: add esbuild(define) tests

[jbedard]

Wrote this to debug something and seems worth adding...

[gregmagolan]

Looks like a platform specific CI failure:

==================== Test output for //examples/define:assertions_test:
5,6c5,6
<   console.log("OUTPUT_DIR: ", "bazel-out/k8-fastbuild/bin/examples/define");
<   console.log("RULE_DIR: ", "bazel-out/k8-fastbuild/bin/examples/define");
---
>   console.log("OUTPUT_DIR: ", "bazel-out/darwin_arm[64](https://github.com/aspect-build/rules_esbuild/actions/runs/4536183799/jobs/7992566293?pr=144#step:6:65)-fastbuild/bin/examples/define");
>   console.log("RULE_DIR: ", "bazel-out/darwin_arm64-fastbuild/bin/examples/define");
FAIL: files "examples/define/sed_bundle_production.js" and "examples/define/bundle_production.expected" differ. 

@@//examples/define:bundle_production.expected is out of date. To update this file, run:

    bazel run //examples/define:assertions

[jbedard]

Opps, had to adjust the regex to handle the additional paths.