[processor/resourcedetection] fix when panic when AKS detector is used

[dloucasfx]

Description:
Address the following panic when AKS detector is used.
This issue was introduced by this change 04327f5

panic: interface conversion: internal.DetectorConfig is nil, not aks.Config

goroutine 1 [running]:
github.com/open-telemetry/opentelemetry-collector-contrib/processor/resourcedetectionprocessor/internal/azure/aks.NewDetector({{{0xc0023d5638, 0x11}, {0x0, 0x0}}, {0xc002568fc0, {0x6877700, 0xc0024f1580},            {0x68a1850, 0xc00251b590}, 0x0, ...}, ...}, ...)
        github.com/open-telemetry/opentelemetry-collector-contrib/processor/resourcedetectionprocessor@v0.81.0/internal/azure/aks/aks.go:34 +0x10a
github.com/open-telemetry/opentelemetry-collector-contrib/processor/resourcedetectionprocessor/internal.(*ResourceProviderFactory).getDetectors(0xc00082ffe0, {{{0xc0023d5638, 0x11}, {0x0, 0x0}}, {0xc002568fc0,       {0x6877700, 0xc0024f1580}, {0x68a1850, 0xc00251b590}, ...}, ...}, ...)
        github.com/open-telemetry/opentelemetry-collector-contrib/processor/resourcedetectionprocessor@v0.81.0/internal/resourcedetection.go:73 +0x182
github.com/open-telemetry/opentelemetry-collector-contrib/processor/resourcedetectionprocessor/internal.(*ResourceProviderFactory).CreateResourceProvider(0xc001dbfeb8?, {{{0xc0023d5638, 0x11}, {0x0, 0x0}},           {0xc002568fc0, {0x6877700, 0xc0024f1580}, {0x68a1850, 0xc00251b590}, ...}, ...}, ...)
        github.com/open-telemetry/opentelemetry-collector-contrib/processor/resourcedetectionprocessor@v0.81.0/internal/resourcedetection.go:49 +0x9d

Link to tracking Issue:

Testing:
Manual validation
Documentation:

[dmitryax]

Thank you, @dloucasfx!