feat(ginkgo/generators): add --tags flag

[alegrey91]

This PR adds a new flag --tags under the ginkgo generate command.
This flag allows the user to add the build tags that he needs for the tests.

Closes #1213

Example command:

ginkgo generate -tags "unit || e2e" test

This will generate the following file:

//go:build unit || e2e

package main_test

import (
	. "github.com/onsi/ginkgo/v2"
	. "github.com/onsi/gomega"

	"github.com/onsi/ginkgo/v2/ginkgo"
)

var _ = Describe("Test", func() {

})

[onsi]

sorry for the delay - i was out on vacation! running this now.