Use consistent naming for remaning initialisms in kubernetes_api module
requested to merge hristiyan.ivanov/gitlab-agent:fix-initialisms-kubernetes_api-module-6 into master
Improve naming for initialisms in kubernetes_api module. This MR is a follow up of !1245 (merged) Includes following changes related to #468 (closed):
- Rename kasK8sUrl to kasK8sURL in kubernetes_api module
- Rename impCiJob* functions in kubernetes_api module
- Rename agentId* variables in proxy.go in kubernetes_api module
- Rename getAgentIdAndTokenFromHeader to getAgentIDAndTokenFromHeader in kubernetes_api module
- Rename getCsrfTokenForSessionCookieRequest to getCSRFTokenForSessionCookieRequest in kubernetes_api module
- Rename agentIdParam to agentIDParam in kubernetes_api module
- Rename parseAgentId to parseAgentID in kubernetes_api module