ssh aws node failure

[tedteng]

Describe the bug

In Gardener hands-on session we met the issue

Warning:
Be aware that you are entering an untrusted environment!
Do not enter credentials or sensitive data within the ssh session that cluster owners should not have access to.
....
Downloaded id_rsa key
Check Public IP
(1/4) Fetching data from target shoot cluster
...
(2/4) Setting up bastion host security group
...exec configurations that could contain malicious code. Please only continue if you have verified it to be uncritical
2021/02/24 08:41:10 AWS CLI failed with
An error occurred (InvalidPermission.Duplicate) when calling the AuthorizeSecurityGroupIngress operation: the specified rule "peer: 10.82.134.65/32, TCP, from port: 22, to port: 22, ALLOW" already exists
exit status 254

the rule that already exists should be skipped but error return and break, then resource leakage
To Reproduce
Steps to reproduce the behavior:

1. gardenctl get target
2. gardenctl ssh node

Expected behavior

1. ssh node
2. or cleanup handling instead of exit status 254 cause the resource leakage

Screenshots
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Gardenctl Version (please complete the following information):

• Version/Commit [e.g. b21b4bd]

Additional context
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