allow `.yml` files as components

[andrew-hillier]

I suspect that this will resolve https://github.com/dapr/dashboard/issues/195

[yaron2]

Thanks for this contribution!

[yaron2]

@andrew-hillier please check why build tests are failing

[andrew-hillier]

@andrew-hillier please check why build tests are failing

Hey! It's due to slices only being available from go 1.21, so have updated to use this one instead, that was available for 1.19: https://pkg.go.dev/golang.org/x/exp/slices

Once the project is updated to 1.21+, then this can be updated to use the slices standard library package once more.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 27.84%. Comparing base (6d4c52a) to head (34f846e).

Files	Patch %	Lines
pkg/components/components.go	60.00%	1 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #270 +/- ## ========================================== + Coverage 27.56% 27.84% +0.27% ========================================== Files 7 7 Lines 798 801 +3 ========================================== + Hits 220 223 +3 Misses 554 554 Partials 24 24 ```

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[yaron2]

@andrew-hillier thanks, we've now upgraded to Go 1.21. if you can resolve the conflicts that'd be great, and we can then merge

[andrew-hillier]

I'll revert the latest commit, as we can use slices from the standard lib too

[andrew-hillier]

@yaron2, had a little trouble with the DCO, but that should be ready to build now.