Does not remove left side CRLF when it appears after a space character

[mfleader]

Describe the bug
removeLeftSideNewLineCharacter() does not remove the left side End Of Line (newline) character, \r\n, when they appear after a space. This issue does not occur in files where the EOL character is \n.

To Reproduce

package main

import (
	"fmt"
	"strings"
)

func removeLeftSideNewLineCharacter(src string) string {
	return strings.TrimLeft(
                strings.TrimLeft(strings.TrimLeft(src, "\r"), "\n"), "\r\n")
}

func existsNewLineCharacter(src string) bool {
	if strings.Index(src, "\n") > 0 {
		return true
	}
	if strings.Index(src, "\r") > 0 {
		return true
	}
	return false
}

func main() {
	input0 := fmt.Sprintf("\r\n src")
	input1 := fmt.Sprintf(" \r\n src")
	fmt.Printf("%v\n", existsNewLineCharacter(
                removeLeftSideNewLineCharacter(input0)))
	fmt.Printf("%v\n", existsNewLineCharacter(
                removeLeftSideNewLineCharacter(input1)))
}

This causes an unexpected key name error.

Expected behavior
I would expect the newline characters to be removed, so that no unexpected key name error is thrown.

---

Describe the bug
A second alternative is that it could instead be an issue with the tokenizer.

key1: 
  key2: abc

There is a space character after key1:. I don't know how to get a carriage return and newline character into the yaml document, so we'll imagine they are there. From viewing this document in the debugger, it appears that this space character is getting grouped with the key2 token, its Token.Origin has the value " \r\n key2". When that trailing space character after key1: is removed all of these issues are resolved. This issue does not occur in files where the EOL character is \n.

Version Variables

• Go version: [e.g. 1.21 ]
• go-yaml's Version: [e.g. v1.11.3 ]