[docs] Upgrade note with Jest version requirements and workaround for older versions of Jest (#5619)

Co-authored-by: Marc Pichler <marc.pichler@dynatrace.com>

doc/frequently-asked-questions.md

@@ -0,0 +1,28 @@
+# Frequently Asked Questions
+
+This FAQ has bits of advice and workarounds for common problems.
+
+## I'm using Jest and get import errors when I run my test suite
+
+Test suite failures of the form:
+
+``` text
+Cannot find module @opentelemetry/foo/bar from @opentelemetry/...
+```
+
+but package `@opentelemetry/foo` is installed may occur with Jest < v29.4.
+This is because older versions of `jest-resolve` cannot find the nested module
+imports used by some OpenTelemetry packages since version 0.56 and higher.
+See [#5618](https://github.com/open-telemetry/opentelemetry-js/issues/5618)
+
+Either upgrade to a newer version of Jest to resolve the issue, or use this
+workaround for older versions of Jest by adding a `moduleNameMapper` rule.
+Add this line to your `jest.config.js`:
+
+``` javascript
+module.exports = {
+  moduleNameMapper: {
+    '^@opentelemetry/([^/]+)/(.+)$': '<rootDir>/node_modules/@opentelemetry/$1/build/src/index-$2',
+  }
+}
+```