skip inconsistent shards if possible (#13945)

data shards were wrong due to a healing bug
reported in #13803 mainly with unaligned object
sizes.

This PR is an attempt to automatically avoid
these shards, with available information about
the `xl.meta` and actually disk mtime.

.github/workflows/go.yml

@@ -13,7 +13,7 @@ concurrency:
 
 jobs:
   build:
-    name: Go ${{ matrix.go-version }} on ${{ matrix.os }}
+    name: Go ${{ matrix.go-version }} on ${{ matrix.os }} - healing
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
@@ -46,4 +46,3 @@ jobs:
           sudo sysctl net.ipv6.conf.all.disable_ipv6=0
           sudo sysctl net.ipv6.conf.default.disable_ipv6=0
           make verify
-          make verify-healing