refactor!(cmdlets): drop vestigial -List switch from Get-* cmdlets

The -List switch was a no-op marker on the default parameter set of six
Get-* cmdlets. Each cmdlet was declared with DefaultParameterSetName = "List"
and the -List switch was the only parameter unique to that set, so it served
no purpose beyond visual decoration: omitting it already routed to List
(because it was the default) and supplying it produced identical behavior.

REMOVED -List from
- Get-InfisicalCertificate
- Get-InfisicalEnvironment
- Get-InfisicalFolder
- Get-InfisicalProject
- Get-InfisicalSecret
- Get-InfisicalTag

UNCHANGED
- DefaultParameterSetName = "List" remains on each cmdlet.
- All other parameters on the List set (filters, ProjectId, etc.) remain
  on ParameterSetName = "List" and continue to disambiguate List vs Single.
- The Single set still requires its keying parameter (-SerialNumber,
  -SecretName, -EnvironmentSlugOrId, -FolderNameOrId, -TagSlugOrId,
  -ProjectId on Get-InfisicalProject) to opt into single mode.

BREAKING
- Scripts that pass -List explicitly (e.g. `Get-InfisicalSecret -List ...`)
  must drop the switch. No other call shape changes.

TESTS
- PkiEndpointRegistryTests.GetInfisicalCertificate_Cmdlet_Exposes_List_Filter_Properties
  no longer asserts the presence of a "List" property.
- 216/216 tests passing.

src/PSInfisicalAPI.Tests/PkiEndpointRegistryTests.cs

@@ -86,7 +86,6 @@ namespace PSInfisicalAPI.Tests
             Assert.NotNull(cmdletType.GetProperty("Limit"));
             Assert.NotNull(cmdletType.GetProperty("Offset"));
             Assert.NotNull(cmdletType.GetProperty("NoAutoPage"));
-            Assert.NotNull(cmdletType.GetProperty("List"));
         }
 
         [Fact]

src/PSInfisicalAPI/Cmdlets/GetInfisicalCertificateCmdlet.cs

@@ -16,7 +16,6 @@ namespace PSInfisicalAPI.Cmdlets
         [Alias("Id", "Identifier")]
         public string SerialNumber { get; set; }
 
-        [Parameter(ParameterSetName = "List")] public SwitchParameter List { get; set; }
         [Parameter(ParameterSetName = "List", Mandatory = true)] public string ProjectId { get; set; }
         [Parameter(ParameterSetName = "List")] public string CommonName { get; set; }
         [Parameter(ParameterSetName = "List")] public string FriendlyName { get; set; }

src/PSInfisicalAPI/Cmdlets/GetInfisicalEnvironmentCmdlet.cs

@@ -16,8 +16,6 @@ namespace PSInfisicalAPI.Cmdlets
 
         [Parameter(Mandatory = true)] public string ProjectId { get; set; }
 
-        [Parameter(ParameterSetName = "List")] public SwitchParameter List { get; set; }
-
         protected override void ProcessRecord()
         {
             try

src/PSInfisicalAPI/Cmdlets/GetInfisicalFolderCmdlet.cs

@@ -18,8 +18,6 @@ namespace PSInfisicalAPI.Cmdlets
         [Parameter(Mandatory = true)] public string Environment { get; set; }
         [Parameter] public string Path { get; set; }
 
-        [Parameter(ParameterSetName = "List")] public SwitchParameter List { get; set; }
-
         protected override void ProcessRecord()
         {
             try

src/PSInfisicalAPI/Cmdlets/GetInfisicalProjectCmdlet.cs

@@ -14,8 +14,6 @@ namespace PSInfisicalAPI.Cmdlets
         [Alias("Id")]
         public string ProjectId { get; set; }
 
-        [Parameter(ParameterSetName = "List")] public SwitchParameter List { get; set; }
-
         [Parameter(ParameterSetName = "List")]
         [ValidateSet("secret-manager", "cert-manager", "kms", "ssh", "secret-scanning", "pam", "ai")]
         public string Type { get; set; }

src/PSInfisicalAPI/Cmdlets/GetInfisicalSecretCmdlet.cs

@@ -26,7 +26,6 @@ namespace PSInfisicalAPI.Cmdlets
         [Parameter(ParameterSetName = "Single")] public int? Version { get; set; }
         [Parameter(ParameterSetName = "Single")] public InfisicalSecretType Type { get; set; } = InfisicalSecretType.Shared;
 
-        [Parameter(ParameterSetName = "List")] public SwitchParameter List { get; set; }
         [Parameter(ParameterSetName = "List")] public SwitchParameter Recursive { get; set; }
         [Parameter(ParameterSetName = "List")] public SwitchParameter IncludePersonalOverrides { get; set; }
         [Parameter(ParameterSetName = "List")] public Hashtable MetadataFilter { get; set; }

src/PSInfisicalAPI/Cmdlets/GetInfisicalTagCmdlet.cs

@@ -16,8 +16,6 @@ namespace PSInfisicalAPI.Cmdlets
 
         [Parameter(Mandatory = true)] public string ProjectId { get; set; }
 
-        [Parameter(ParameterSetName = "List")] public SwitchParameter List { get; set; }
-
         protected override void ProcessRecord()
         {
             try