typeToString: type float => typedesc[float] (#17011)

* typeToString: type float => typedesc[float]

* fixup

* fix tests

tests/errmsgs/t8610.nim

@@ -1,5 +1,5 @@
 discard """
-  errormsg: "invalid type: 'type int' for const"
+  errormsg: "invalid type: 'typedesc[int]' for const"
 """
-## issue #8610
+## bug #8610
 const Foo = int

tests/errmsgs/tconceptconstraint.nim

@@ -2,7 +2,7 @@ discard """
   errormsg: "cannot instantiate B"
   line: 20
   nimout: '''
-got: <type string>
+got: <typedesc[string]>
 but expected: <T: A>
 '''
 """

tests/errmsgs/tgenericconstraint.nim

@@ -2,7 +2,7 @@ discard """
   errormsg: "cannot instantiate B"
   line: 14
   nimout: '''
-got: <type int>
+got: <typedesc[int]>
 but expected: <T: string or float>
 '''
 """

tests/errmsgs/twrong_at_operator.nim

@@ -1,17 +1,17 @@
 discard """
-errormsg: "type mismatch: got <array[0..0, type int]>"
+errormsg: "type mismatch: got <array[0..0, typedesc[int]]>"
 line: 22
 nimout: '''
-twrong_at_operator.nim(22, 30) Error: type mismatch: got <array[0..0, type int]>
+twrong_at_operator.nim(22, 30) Error: type mismatch: got <array[0..0, typedesc[int]]>
 but expected one of:
 proc `@`[IDX, T](a: sink array[IDX, T]): seq[T]
   first type mismatch at position: 1
   required type for a: sink array[IDX, T]
-  but expression '[int]' is of type: array[0..0, type int]
+  but expression '[int]' is of type: array[0..0, typedesc[int]]
 proc `@`[T](a: openArray[T]): seq[T]
   first type mismatch at position: 1
   required type for a: openArray[T]
-  but expression '[int]' is of type: array[0..0, type int]
+  but expression '[int]' is of type: array[0..0, typedesc[int]]
 
 expression: @[int]
 '''