Constraints break backward-compatibility check

[AgnesToulet]

Having constraints in the schemas is breaking the backward-compatibility check when binding lineages.

This following lineage should be valid but is considered invalid and throws the error below:

Lineage:

import (
    "strings"
    "time"

    "github.com/grafana/thema"
)

lin: thema.#Lineage
lin: name: "constraints"
lin: schemas: [{
    version: [0, 0]
    schema: {
	aString: string & strings.MinRunes(1)
	aTime: string & time.Time
	anInt: uint32 & >0 & <=24 | *12
    }
},
{
    version: [0, 1]
    schema: {
	aString: string & strings.MinRunes(1)
	aTime: string & time.Time
	anInt: uint32 & >0 & <=24 | *12

        secondfield?: int32
    }
}]

lin: lenses: [{
    from: [0, 1]
    to: [0, 0]
    input: _
    result: {
        aString: input.aString
        aTime: input.aTime
        anInt: input.anInt
    }
}]

Error:

    lineage_test.go:33: error binding lineage: schema 0.1 is not backwards compatible with schema 0.0:
        (1) forced error mark
          | "invalid lineage"
          | github.com/cockroachdb/errors/withstack/*withstack.withStack::
        Wraps: (2) schema 0.1 is not backwards compatible with schema 0.0:
          | field aString not present in {aString:strings.MinRunes(1),aTime:time.Time(),anInt:*12 | >0 & <=24 & int}:
          |     C:\Users\agnes\Documents\as-code\thema\lineage.cue:247:10
          |     C:\Users\agnes\Documents\as-code\thema\testdata\lineage\in.cue:13:13
          | missing field "aString"
          | invalid value strings.MinRunes(1) (does not satisfy strings.MinRunes(1)): error in call to strings.MinRunes: non-concrete value string:
          |     C:\Users\agnes\Documents\as-code\thema\testdata\lineage\in.cue:22:21
          |     C:\Users\agnes\Documents\as-code\thema\testdata\lineage\in.cue:14:21
          |     C:\Users\agnes\Documents\as-code\thema\testdata\lineage\in.cue:22:38
        Error types: (1) *markers.withMark (2) *errors.errorString

I opened an issue in the CUE repo to fix the behavior of Subsume: cue-lang/cue#2419

Meanwhile, we should ignore these errors.