tools: use os home dir to instead of the hardcoded PATH (#9444)

porting PR #6498 to main

#### PR checklist

- [x] Tests written/updated, or no tests needed
- [x] `CHANGELOG_PENDING.md` updated, or no changelog entry needed
- [x] Updated relevant documentation (`docs/`) and code comments, or no
      documentation updates needed

CHANGELOG_PENDING.md

@@ -17,6 +17,9 @@
 - Data Storage
   - [state] \#6541 Move pruneBlocks from consensus/state to state/execution. (@JayT106)
   
+- Tooling
+  - [tools/tm-signer-harness] \#6498 Set OS home dir to instead of the hardcoded PATH. (@JayT106)
+
 ### FEATURES
 
 ### IMPROVEMENTS

tools/tm-signer-harness/Makefile

@@ -3,7 +3,7 @@
 TENDERMINT_VERSION?=latest
 BUILD_TAGS?='tendermint'
 VERSION := $(shell git describe --always)
-BUILD_FLAGS = -ldflags "-X github.com/tendermint/tendermint/version.TMCoreSemVer=$(VERSION)
+BUILD_FLAGS = -ldflags "-X github.com/tendermint/tendermint/version.TMCoreSemVer=$(VERSION)"
 
 .DEFAULT_GOAL := build
 

tools/tm-signer-harness/main.go

@@ -17,7 +17,6 @@ import (
 const (
 	defaultAcceptRetries    = 100
 	defaultBindAddr         = "tcp://127.0.0.1:0"
-	defaultTMHome           = "~/.tendermint"
 	defaultAcceptDeadline   = 1
 	defaultConnDeadline     = 3
 	defaultExtractKeyOutput = "./signing.key"
@@ -59,6 +58,7 @@ Use "tm-signer-harness help <command>" for more information about that command.`
 		fmt.Println("")
 	}
 
+	defaultTMHome := internal.ExpandPath("~/.tendermint")
 	runCmd = flag.NewFlagSet("run", flag.ExitOnError)
 	runCmd.IntVar(&flagAcceptRetries,
 		"accept-retries",