Fix performance regression with spack mirror create --all (#32005)

This PR fixes the performance regression reported in #31985 and a few
other issues found while refactoring the spack mirror create command.

Modifications:

* (Primary) Do not require concretization for
  `spack mirror create --all`
* Forbid using --versions-per-spec together with --all
* Fixed a few issues when reading specs from input file (specs were
  not concretized, command would fail when trying to mirror
  dependencies)
* Fix issue with default directory for spack mirror create not being
  canonicalized
* Add more unit tests to poke spack mirror create
* Skip externals also when mirroring environments
* Changed slightly the wording for reporting (it was mentioning
  "Successfully created" even in presence of errors)
* Fix issue with colify (was not called properly during error
  reporting)

var/spack/repos/builtin/packages/rkt-base/package.py

@@ -17,6 +17,6 @@ class RktBase(RacketPackage):
     version("8.3", commit="cab83438422bfea0e4bd74bc3e8305e6517cf25f")  # tag='v8.3'
     depends_on("racket@8.3", type=("build", "run"), when="@8.3")
 
-    name = "base"
+    racket_name = "base"
     pkgs = True
-    subdirectory = "pkgs/{0}".format(name)
+    subdirectory = "pkgs/{0}".format(racket_name)

var/spack/repos/builtin/packages/rkt-cext-lib/package.py

@@ -20,6 +20,6 @@ class RktCextLib(RacketPackage):
     depends_on("rkt-dynext-lib@8.3", type=("build", "run"), when="@8.3")
     depends_on("rkt-scheme-lib@8.3", type=("build", "run"), when="@8.3")
 
-    name = "cext-lib"
+    racket_name = "cext-lib"
     pkgs = True
-    subdirectory = name
+    subdirectory = racket_name

var/spack/repos/builtin/packages/rkt-compiler-lib/package.py

@@ -20,6 +20,6 @@ class RktCompilerLib(RacketPackage):
     depends_on("rkt-rackunit-lib@8.3", type=("build", "run"), when="@8.3")
     depends_on("rkt-zo-lib@1.3", type=("build", "run"), when="@8.3")
 
-    name = "compiler-lib"
+    racket_name = "compiler-lib"
     pkgs = True
-    subdirectory = "pkgs/{0}".format(name)
+    subdirectory = "pkgs/{0}".format(racket_name)

var/spack/repos/builtin/packages/rkt-dynext-lib/package.py

@@ -16,6 +16,6 @@ class RktDynextLib(RacketPackage):
     version("8.3", commit="cc22e2456df881a9008240d70dd9012ef37395f5")  # tag = 'v8.3'
     depends_on("rkt-base@8.3", type=("build", "run"), when="@8.3")
 
-    name = "dynext-lib"
+    racket_name = "dynext-lib"
     pkgs = True
-    subdirectory = name
+    subdirectory = racket_name

var/spack/repos/builtin/packages/rkt-rackunit-lib/package.py

@@ -17,6 +17,6 @@ class RktRackunitLib(RacketPackage):
     depends_on("rkt-base@8.3:", type=("build", "run"), when="@8.3")
     depends_on("rkt-testing-util-lib@8.3", type=("build", "run"), when="@8.3")
 
-    name = "rackunit-lib"
+    racket_name = "rackunit-lib"
     pkgs = True
-    subdirectory = name
+    subdirectory = racket_name

var/spack/repos/builtin/packages/rkt-scheme-lib/package.py

@@ -16,5 +16,5 @@ class RktSchemeLib(RacketPackage):
     version("8.3", commit="a36e729680818712820ee5269f5208c3c0715a6a")  # tag='v8.3'
     depends_on("rkt-base@8.3", type=("build", "run"), when="@8.3")
 
-    name = "scheme-lib"
+    racket_name = "scheme-lib"
     pkgs = True

var/spack/repos/builtin/packages/rkt-testing-util-lib/package.py

@@ -16,6 +16,6 @@ class RktTestingUtilLib(RacketPackage):
     version("8.3", commit="683237bee2a979c7b1541092922fb51a75ea8ca9")  # tag='v8.3'
     depends_on("rkt-base@8.3:", type=("build", "run"), when="@8.3")
 
-    name = "testing-util-lib"
+    racket_name = "testing-util-lib"
     pkgs = True
-    subdirectory = name
+    subdirectory = racket_name

var/spack/repos/builtin/packages/rkt-zo-lib/package.py

@@ -16,6 +16,6 @@ class RktZoLib(RacketPackage):
     version("1.3", commit="cab83438422bfea0e4bd74bc3e8305e6517cf25f")  # tag='v1.3'
     depends_on("rkt-base@8.3:", type=("build", "run"), when="@1.3")
 
-    name = "zo-lib"
+    racket_name = "zo-lib"
     pkgs = True
-    subdirectory = "pkgs/{0}".format(name)
+    subdirectory = "pkgs/{0}".format(racket_name)