Host-Agent bootstrap flow tests are flaky

[dharmjit]

One of the Host-Agent tests is flaky. It seems like CSRs are not getting cleaned up.

Failure [17.727 seconds]
Agent When the host agent is executed with SecureAccess feature flag [It] should create kubeconfig if the csr is approved 
/home/kokoni/forks/cluster-api-provider-bringyourownhost/agent/host_agent_test.go:688

  Timed out after 4.000s.
  Expected
      <bool>: false
  to be true

Host-Agent Logs

######################Start: Content of /tmp/agent-integration.log##################
\I0520 04:20:28.761840      56 feature_gate.go:245] feature gates: &{map[SecureAccess:true]}
I0520 04:20:29.368064      56 main.go:108]  "msg"="secure access enabled, waiting for host to be registered by ByoAdmission Controller"  
I0520 04:20:29.972169      56 logr.go:249] controller-runtime/metrics "msg"="Metrics server is starting to listen"  "addr"=":8080"
`I0520 04:20:30.047663      56 installer.go:129]  "msg"="Detected"  "OS"="Ubuntu_20.04.4_x86-64"
]I0520 04:20:30.047909      56 main.go:252]  "msg"="creating host csr"  "name"="byoh-csr-rat"
SI0520 04:20:30.053919      56 csr.go:77] csr for this node already exists, reusing
E0520 04:20:30.058766      56 main.go:237]  "msg"="kubeconfig creation failed" "error"="retrieved csr is not compatible: error validating signature new CSR against old key: x509: ECDSA verification failure"