Install kubectl for e2e tests

[Amulyam24]

What this PR does / why we need it:
E2E tests require kubectl as a prerequisite. Install it via existing scripts.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

/area provider/ibmcloud

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

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[k8s-ci-robot]

Hi @Amulyam24. Thanks for your PR.

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[Amulyam24]

@mkumatag , missed this earlier in local testing(as if was already installed) but kubectl is required for applying the cluster template.

INFO: Applying the cluster template yaml to the cluster                                                                           
                                                                                                                                             
[AfterEach] Workload cluster creation                                                                                                        
  /root/go/src/github.com/cluster-api-provider-ibmcloud/test/e2e/e2e_test.go:76                                                              
STEP: Unable to dump workload cluster logs as the cluster is nil                                                                             
STEP: Dumping all the Cluster API resources in the "create-workload-cluster-9uqod5" namespace                                                
STEP: Deleting all clusters in the create-workload-cluster-9uqod5 namespace                                                                  
STEP: Deleting namespace used for hosting the "create-workload-cluster" test spec                                                            
INFO: Deleting namespace create-workload-cluster-9uqod5                                                                                      
                                                                                                                                             
• Failure [0.880 seconds]                                                                                                                    
Workload cluster creation                                                                                                                    
/root/go/src/github.com/cluster-api-provider-ibmcloud/test/e2e/e2e_test.go:41                                                                
  Creating a highly available control-plane cluster                                                                                          
  /root/go/src/github.com/cluster-api-provider-ibmcloud/test/e2e/e2e_test.go:137                                                             
    Should create a cluster with 3 control-plane nodes and 1 worker node [It]                                                                
    /root/go/src/github.com/cluster-api-provider-ibmcloud/test/e2e/e2e_test.go:138                                                           
                                                                                                                                             
    Expected success, but got an error:                                                                                                      
        <*errors.withStack | 0xc000643818>: {                                                                                                
            error: <*exec.Error | 0xc001dbd620>{
                Name: "kubectl",
                Err: <*errors.errorString | 0xc0003373d0>{
                    s: "executable file not found in $PATH",
                },
            },                     
            stack: [0x1546667, 0x1546c7d, 0x16dc84c, 0x1a7ef94, 0x1ad8834, 0x73283a, 0x732205, 0x7318fb, 0x737689, 0x737067, 0x758525, 0x7582
45, 0x757a85, 0x759d32, 0x765ee5, 0x765cfe, 0x1ad715e, 0x515042, 0x46b181],
        }                          
        exec: "kubectl": executable file not found in $PATH

    /root/go/pkg/mod/sigs.k8s.io/cluster-api/[email protected]/framework/clusterctl/clusterctl_helpers.go:273

[mkumatag]

/ok-to-test

[mkumatag]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Amulyam24, mkumatag

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