Move pkg/gzipfs to internal/gzipfs (jaegertracing#6897)

## Which problem is this PR solving?
- **Resolves** jaegertracing#6869

## Description of the changes
- Moved `pkg/gzipfs/` to `internal/gzipfs/`
- Updated all imports referencing `pkg/gzipfs/` to `internal/gzipfs/`

## How was this change tested?
-

## Checklist
- [ ] I have read
https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
- [ ] I have signed all commits
- [ ] I have added unit tests for the new functionality
- [ ] I have run lint and test steps successfully
  - for `jaeger`: `make lint test`
  - for `jaeger-ui`: `npm run lint` and `npm run test`

Signed-off-by: sAchin-680 <[email protected]>
Signed-off-by: amol-verma-allen <[email protected]>

Author: sAchin-680

cmd/query/app/ui/assets.go

@@ -9,7 +9,7 @@ import (
 
 	"go.uber.org/zap"
 
-	"github.com/jaegertracing/jaeger/pkg/gzipfs"
+	"github.com/jaegertracing/jaeger/internal/gzipfs"
 	"github.com/jaegertracing/jaeger/pkg/httpfs"
 )
 

pkg/gzipfs/gzip.go renamed to internal/gzipfs/gzip.go

@@ -90,7 +90,7 @@ func TestFS(t *testing.T) {
 			// To provide coverage of the error from io.ReadAll function, we use a file
 			// that is a copy of proper gzipped file testdata/foobaz.gz but truncated
 			// to 36 bytes with:
-			//     perl -e "truncate 'pkg/gzipfs/testdata/foobaz_truncated.gz', 36"
+			//     perl -e "truncate 'internal/gzipfs/testdata/foobaz_truncated.gz', 36"
 			// This allows gzip.NewReader() to succeed because the file has a proper gz
 			// header, but subsequent read fails with unexpected EOF.
 			name:        "compressed but truncated file accessed without gz extension",