feat(kubernetes/shell): kubectl web shell and kubeconfig functionality EE-448 (#5229)

* feat(kubernetes/shell): backport kubectl shell backend functionality EE-849 (#5168)

* backported core backend kubectl shell functionality

* - backported kubectl shell unit tests
- backported k8s cli interface update
- backported k8s client library fake patch

* refactored backend to match EE

* fixed test error typo

* GetServiceAccountName -> GetServiceAccount - making the function reusable in multiple contexts

* feat(kubernetes/shell): backport kubeconfig generation backend functionality EE-1004 (#5213)

* backported core backend kubectl shell functionality

* refactored backend to match EE

* - backported kubernetes backend handler implementation
- backported kubernetes config endpoint
- backported kubeconfig file generation
- backported kubeconfig and yaml unit tests
- backported updates to kubeclient interfaces

* feat(app): kubectl shell ui backport EE-927 (#5221)

* Kubectl UI backport to CE

* fix authentication redirect issue

* comment out redirect function

* fix shell full width & change name of shell

* disable button when terminal connected

* fixed whitespace changes for css

* fixed whitespace changes for html

* linting fixes

Co-authored-by: zees-dev <dev.786zshan@gmail.com>

* feat(kubernetes/shell): backport of kubeconfig export functionality EE-926 (#5228)

* EE backport of kubeconfig UI functionality

* using angularjs constant instead of hardcoded URL

* updated portainer kubectl shell image

* fix kubectl button position issue in ce

* fix pod keep running when switching page

* feat(app): Kubectl shell ui EE-833 EE-1099 (#5271)

* fix kubectl shell css

* fix mini css issue

* fix tech issue for ui changes from review

* delete unuse file

* - refactored variable names
- restored content-wrapper scroll
- created object to store wrapper css

Co-authored-by: zees-dev <dev.786zshan@gmail.com>

* addressing PR issues

* fix required changes from tech reviews (#5319)

* fix required changes from tech reviews

* remove unuse css variable

* component refactor accoridng to PR and style guidelines

Co-authored-by: zees-dev <dev.786zshan@gmail.com>

* removed redundant dockerhub api endpoint variable

* - autoHeight -> terminal-window
- removed redundant try-catch
- saving config.yaml file as config

* fix(kube/shell): show error on failure

* fixed default https bug

* resolved merge conflicts

Co-authored-by: Richard Wei <54336863+WaysonWei@users.noreply.github.com>
Co-authored-by: richard <richard@richards-iMac-Pro.local>
Co-authored-by: Chaim Lev-Ari <chiptus@gmail.com>

api/portainer.go

@@ -1,11 +1,14 @@
 package portainer
 
 import (
+	"context"
 	"io"
 	"net/http"
 	"time"
 
 	gittypes "github.com/portainer/portainer/api/git/types"
+	v1 "k8s.io/api/core/v1"
+	clientV1 "k8s.io/client-go/tools/clientcmd/api/v1"
 )
 
 type (
@@ -436,6 +439,14 @@ type (
 		Type string `json:"Type"`
 	}
 
+	// KubernetesShellPod represents a Kubectl Shell details to facilitate pod exec functionality
+	KubernetesShellPod struct {
+		Namespace        string
+		PodName          string
+		ContainerName    string
+		ShellExecCommand string
+	}
+
 	// LDAPGroupSearchSettings represents settings used to search for groups in a LDAP server
 	LDAPGroupSearchSettings struct {
 		// The distinguished name of the element from which the LDAP server will search for groups
@@ -1172,8 +1183,10 @@ type (
 
 	// KubeClient represents a service used to query a Kubernetes environment
 	KubeClient interface {
+		GetServiceAccount(tokendata *TokenData) (*v1.ServiceAccount, error)
 		SetupUserServiceAccount(userID int, teamIDs []int, restrictDefaultNamespace bool) error
 		GetServiceAccountBearerToken(userID int) (string, error)
+		CreateUserShellPod(ctx context.Context, serviceAccountName string) (*KubernetesShellPod, error)
 		StartExecProcess(token string, useAdminToken bool, namespace, podName, containerName string, command []string, stdin io.Reader, stdout io.Writer) error
 		NamespaceAccessPoliciesDeleteNamespace(namespace string) error
 		GetNamespaceAccessPolicies() (map[string]K8sNamespaceAccessPolicy, error)
@@ -1181,6 +1194,7 @@ type (
 		DeleteRegistrySecret(registry *Registry, namespace string) error
 		CreateRegistrySecret(registry *Registry, namespace string) error
 		IsRegistrySecret(namespace, secretName string) (bool, error)
+		GetKubeConfig(ctx context.Context, apiServerURL string, bearerToken string, tokenData *TokenData) (*clientV1.Config, error)
 	}
 
 	// KubernetesDeployer represents a service to deploy a manifest inside a Kubernetes endpoint