chore: Remove 'Run instrumentation tests' section from Contribution Guide (#3172)

Author: jvh-aws

CONTRIBUTING.md

@@ -17,7 +17,6 @@ contribution.
   - [Workflows](#workflows)
     - [Adding Code to Support a New Feature](#adding-code-to-support-a-new-feature)
     - [Build and Validate Your Work](#build-and-validate-your-work)
-    - [Run Instrumentation Tests](#run-instrumentation-tests)
     - [Test changes to CodeBuild build definitions](#test-changes-to-codebuild-build-definitions)
   - [Reporting Bugs/Feature Requests](#reporting-bugsfeature-requests)
   - [Contributing via Pull Requests](#contributing-via-pull-requests)
@@ -319,37 +318,6 @@ Tip: Checkstyle specifies a specific ordering and spacing of import statements,
 To setup the Android Studio editor to automatically organize import according to the project checkstyle,  go to
 Preferences > Editor > Code Style > Java.  Under Scheme, select "Project".
 
-### Run Instrumentation Tests
-
-The instrumentation tests presume the presence of various backend resources.
-Currently, there is no mechanism for contributors to easily allocate
-these resources. This is tracked in [Amplify issue 301](https://github.com/aws-amplify/amplify-android/issues/301).
-
-AWS maintainers can gain access to `awsconfiguration.json` and
-`amplifyconfiguration.json` files in an S3 bucket, to find
-configurations suitable for running the integration tests.
-
-If you are part of the private access list, the command below will copy
-those configurations to your local workspace:
-
-```shell
-cd amplify-android
-.circleci/copy-configs
-```
-
-To run a __specific__ test:
-
-```shell
-test='com.amplifyframework.api.aws.RestApiInstrumentationTest#getRequestWithIAM'
-./gradlew cAT -Pandroid.testInstrumentationRunnerArguments.class="$test"
-```
-
-To run __all__ tests:
-
-```shell
-./gradlew cAT
-```
-
 ### Test changes to CodeBuild build definitions
 
 Changes made to one of the buildspec files under the `./scripts` folder can be tested locally inside a docker container (See [setup instructions](https://docs.aws.amazon.com/codebuild/latest/userguide/use-codebuild-agent.html) in the CodeBuild docs).