Validator should not report ucan/attest capability in unknown set

[Gozala]

General validation pass only considers passed capability schema, and if capability been parsed does not match it is reported to the validator which includes it in the general error

ucanto/packages/validator/src/capability.js

Lines 740 to 742 in 7744f57

	if (descriptor.can !== capability.can) {
	return new UnknownCapability(capability)
	}

ucan/attest is only accessed in a specific code path

ucanto/packages/validator/src/lib.js

Lines 578 to 594 in 7744f57

	const verifySession = async (delegation, proofs, config) => {
	// Create a schema that will match an authorization for this exact delegation
	const attestation = capability({
	with: Schema.literal(config.authority.did()),
	can: 'ucan/attest',
	nb: Schema.struct({
	proof: Schema.link(delegation.cid),
	}),
	})
	return await claim(
	attestation,
	// We omit the delegation otherwise we may end up in an infinite loop
	proofs.filter(proof => proof != delegation),
	config
	)
	}

We should update couple of code paths to exclude ucan/attest from the list of unknown capability reports

ucanto/packages/validator/src/capability.js

Lines 828 to 838 in 7744f57

	const select = (matcher, capabilities) => {
	const unknown = []
	const matches = []
	const errors = []
	for (const capability of capabilities) {
	const result = matcher.match(capability)
	if (result.error) {
	switch (result.name) {
	case 'UnknownCapability':
	unknown.push(result.capability)
	break