Various code inspection resolutions (#7438)

* remove unused code

* remove defer use in loop

* Remove unused methods and constants

* gofmt and gaz

* nilness check

* remove unused args

* Add TODO for refactoring subscribeWithBase to remove unused arg. It seems too involved to include in this sweeping PR. https://github.com/prysmaticlabs/prysm/issues/7437

* replace empty slice declaration

* Remove unnecessary type conversions

* remove redundant type declaration

* rename receivers to be consistent

* Remove bootnode query tool. It is now obsolete by discv5

* Remove relay node. It is no longer used or supported

* Revert "Remove relay node. It is no longer used or supported"

This reverts commit 4bd7717334.

* Delete unused test directory

* Delete unsupported gcp startup script

* Delete old k8s script

* build fixes

* fix build

* go mod tidy

* revert slasher/db/kv/block_header.go

* fix build

* remove redundant nil check

* combine func args

Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>
Co-authored-by: Victor Farazdagi <simple.square@gmail.com>

tools/analyzers/maligned/maligned.go

@@ -15,7 +15,7 @@ import (
 	"strings"
 )
 
-func malign(pos token.Pos, str *types.Struct) error {
+func malign(_ token.Pos, str *types.Struct) error {
 	wordSize := int64(8)
 	maxAlign := int64(8)
 	switch build.Default.GOARCH {