Issue title: [Security Solution] URL includes the old nomenclature for the advanced tab: 'Custom'
 Issue body: **Describe the feature**
URL includes the old nomenclature for the advanced tab: 'Custom'

**Build Details:**
```
VERSION: 7.14.0-SNAPSHOT
BUILD: 41434
COMMIT: 88615e49f65668b3f8ea707c0bb580580189c297
ARTIFACT: https://artifacts-api.elastic.co/v1/search/7.14.0-SNAPSHOT
```

**Preconditions**
1. Elastic 7.13.0 environment should be deployed.

**Steps to Reproduce**
1. Navigate to the Integrations Tab under the Fleet
2. Select the Endpoint Security Integration
3. Navigate to the Advanced tab
4. Oberve that the URL is not matched with the Tab name

**Test data**
N/A

**Impacted Test case(s)**
N/A

**Actual Result**
URL includes the old nomenclature for the advanced tab: 'Custom'

**Expected Result**
URL should be updated for the advanced tab.

**What's Working**
N/A

**What's Not Working**
N/A

**Screenshot**
![WrongURLNaming](https://user-images.githubusercontent.com/60252716/120800112-3498ed80-c55d-11eb-9277-090f0eac21ab.JPG)

**Logs**:
N/A
 Comments: 
 Comment 0: Pinging @elastic/security-solution (Team: SecuritySolution)
 Comment 1: Pinging @elastic/security-onboarding-and-lifecycle-mgt (Team:Onboarding and Lifecycle Mgt)
 Comment 2: @manishgupta-qasource please review!!
 Comment 3: Reviewed & Assigned to @kevinlog 
{'source': 'GithubIssues', 'repo_name_with_owner': 'elastic/kibana', 'issue_id': 911442708, 'repo_stars': 16051.0}