🚀 [Feature]: Rename RunStartedAt attribute to StartedAt for workflow runs + example update (#480)

## Description

This pull request refactors PowerShell scripts for managing GitHub apps
and updates a property name in the `GitHubWorkflowRun` class for
consistency. The changes focus on improving code clarity, standardizing
naming conventions, and enhancing maintainability.

### 🌟 Updates to `GitHubWorkflowRun` class:

* Renamed the `RunStartedAt` property to `StartedAt` for consistency
with other properties.
* Updated the constructor to reflect the property name change from
`RunStartedAt` to `StartedAt`.

### Refactoring of GitHub app management scripts:

* Removed the `examples/Apps/AppManagement.ps1` example entirely,
consolidating its functionality into `examples/Apps/EnterpriseApps.ps1`
for better organization.
* Updated `examples/Apps/EnterpriseApps.ps1` to:
  - Replace hardcoded app IDs with a more flexible `$ClientIDs` array.
- Introduce parameters for private key and client ID authentication
(`$PrivateKey` and `$ClientID`).
- Simplify organization filtering by using `$org.Name` instead of
`$org.login`.

## Type of change

<!-- Use the check-boxes [x] on the options that are relevant. -->

- [ ] 📖 [Docs]
- [ ] 🪲 [Fix]
- [ ] 🩹 [Patch]
- [ ] ⚠️ [Security fix]
- [x] 🚀 [Feature]
- [ ] 🌟 [Breaking change]

## Checklist

<!-- Use the check-boxes [x] on the options that are relevant. -->

- [x] I have performed a self-review of my own code
- [x] I have commented my code, particularly in hard-to-understand areas

Author: MariusStorhaug

examples/Apps/AppManagement.ps1

@@ -1,40 +1,23 @@
-$appIDs = @(
-    'qweqweqwe',
-    'qweqweqweqwe'
-)
-
-$organization = '*'
-filter Install-GithubApp {
-    param(
-        [Parameter()]
-        [string] $Enterprise = 'msx',
+$ClientID = ''
+$PrivateKey = @'
+-----BEGIN RSA PRIVATE KEY-----
 
-        [Parameter()]
-        [string] $Organization = '*',
+-----END RSA PRIVATE KEY-----
+'@
+Connect-GitHub -ClientID $ClientID -PrivateKey $PrivateKey
+Connect-GitHubApp -Enterprise 'msx'
 
-        [Parameter(
-            Mandatory,
-            ValueFromPipeline
-        )]
-        [string] $AppID
-    )
+# The apps you want to install on orgs in the enterprise
+$ClientIDs = @(
+    'Iv1.f26b61bc99e69405'
+)
+$Enterprise = 'msx'
+$Organization = '*'
 
-    process {
-        $installableOrgs = Get-GitHubOrganization -Enterprise $Enterprise
-        $orgs = $installableOrgs | Where-Object { $_.login -like $organization }
-        foreach ($org in $orgs) {
-            foreach ($appIDitem in $AppID) {
-                Install-GitHubApp -Enterprise $Enterprise -Organization $org.login -ClientID $appIDitem -RepositorySelection all | ForEach-Object {
-                    [PSCustomObject]@{
-                        Organization = $org.login
-                        AppID        = $appIDitem
-                    }
-                }
-            }
-        }
+$installableOrgs = Get-GitHubOrganization -Enterprise $Enterprise
+$orgs = $installableOrgs | Where-Object { $_.Name -like $Organization }
+foreach ($org in $orgs) {
+    foreach ($ClientID in $ClientIDs) {
+        Install-GitHubApp -Enterprise $Enterprise -Organization $org.Name -ClientID $ClientID -RepositorySelection all
     }
 }
-
-$appIDs | Install-GitHubApp -Organization $organization
-
-$installation = Get-GitHubAppInstallation

examples/Apps/EnterpriseApps.ps1

@@ -85,7 +85,7 @@
 
     # The start time of the latest run. Resets on re-run.
     # Example: "2023-01-01T12:01:00Z"
-    [System.Nullable[datetime]] $RunStartedAt
+    [System.Nullable[datetime]] $StartedAt
 
     # The head commit details.
     # Example: (nullable-simple-commit object)
@@ -126,7 +126,7 @@
         $this.PullRequests = $_.pull_requests
         $this.CreatedAt = $_.created_at
         $this.UpdatedAt = $_.updated_at
-        $this.RunStartedAt = $_.run_started_at
+        $this.StartedAt = $_.run_started_at
         $this.Actor = [GitHubUser]::new($_.actor)
         $this.TriggeringActor = [GitHubUser]::new($_.triggering_actor)
         $this.HeadCommit = $_.head_commit