ci: retry test failing for getting started integration tests (#9740)

closes: #9325

## Description

This PR fixes the issue with the integration (link-cli/yarn) job where on a retry of the step (due to the `nick-fields/retry` github action), the step fails because of a `file already exists` error.

The error occurs because we create an `bin/agoric` file in the previous run and on the retry it tries to recreate the file which already exists.

This is done by removing the `bin/agoric` file before the next retry occurs 


Here is a test run for this PR where the job (link-cli/yarn) failed. The CI job repeats without any issues.
https://github.com/Agoric/agoric-sdk/actions/runs/10036266195/job/27733694026?pr=9740

### Security Considerations


### Scaling Considerations


### Documentation Considerations


### Testing Considerations


### Upgrade Considerations

.github/workflows/integration.yml

@@ -99,6 +99,7 @@ jobs:
           # won't increase the time for this workflow to complete.
           timeout_minutes: 20
           command: scripts/registry.sh test ${{ matrix.cli }} ${{steps.get-branch.outputs.result}}
+          on_retry_command: rm $HOME/bin/agoric
 
       - name: notify on failure
         if: >

scripts/registry.sh

@@ -104,8 +104,6 @@ integrationTest() {
   # Install the Agoric CLI on this machine's $PATH.
   case $1 in
     link-cli | link-cli/*)
-      # Prevent retries from failing with "must not already exist"
-      rm -f "$HOME/bin/agoric"
       yarn link-cli "$HOME/bin/agoric"
       persistVar AGORIC_CMD "[\"$HOME/bin/agoric\"]"
       ;;