refactor(repository): refactor internal/repolog package to support writing metrics in the future (#3610)

* renamed internal/repolog to internal/repodiag

* refactored initialization

* additional tests

* linter fixes

cli/command_blob_list.go

@@ -5,7 +5,7 @@ import (
 	"strings"
 
 	"github.com/kopia/kopia/internal/epoch"
-	"github.com/kopia/kopia/internal/repolog"
+	"github.com/kopia/kopia/internal/repodiag"
 	"github.com/kopia/kopia/repo"
 	"github.com/kopia/kopia/repo/blob"
 	"github.com/kopia/kopia/repo/content/indexblob"
@@ -66,7 +66,7 @@ func (c *commandBlobList) shouldInclude(b blob.Metadata) bool {
 			return false
 		}
 
-		if strings.HasPrefix(string(b.BlobID), repolog.BlobPrefix) {
+		if strings.HasPrefix(string(b.BlobID), repodiag.LogBlobPrefix) {
 			return false
 		}
 

cli/command_logs_session.go

@@ -11,7 +11,7 @@ import (
 	"github.com/pkg/errors"
 
 	"github.com/kopia/kopia/internal/clock"
-	"github.com/kopia/kopia/internal/repolog"
+	"github.com/kopia/kopia/internal/repodiag"
 	"github.com/kopia/kopia/repo/blob"
 )
 
@@ -70,7 +70,7 @@ func getLogSessions(ctx context.Context, st blob.Reader) ([]*logSessionInfo, err
 
 	var allSessions []*logSessionInfo
 
-	if err := st.ListBlobs(ctx, repolog.BlobPrefix, func(bm blob.Metadata) error {
+	if err := st.ListBlobs(ctx, repodiag.LogBlobPrefix, func(bm blob.Metadata) error {
 		parts := strings.Split(string(bm.BlobID), "_")
 
 		//nolint:gomnd