Autocomplete regex several issues

[mdisibio]

Describe the bug
(1) If we try to autocomplete a query like { .foo=~"(a|b)"} it seems like it should work but it doesn't (any tag name, doesn't matter). From debugging it is failing the check for single spanset operation, so probably the pipe | is incorrectly caught as a OR operation. Likely just need a tweak to the singleFilterRegexp regex: https://github.com/grafana/tempo/blob/main/pkg/traceql/extractmatcher.go#L36

(2) Simplifying the condition to =~"a" it still doesn't work. Here it is failing the matchersRegexp. I believe it's this section: [=|<=|>=|=~|!=|>|<|!~] which needs to be wrapped in parens instead of brackets to catch the multi-char operators: (=|<=|>=|=~|!=|>|<|!~)

Here's are some test cases for TextExtractMatchers:

{
    name:     "test",
    query:    `{.foo=~"(a|b)"}`,
    expected: `{.foo=~"(a|b)"}`,
},
{
    name:     "test",
    query:    `{.foo=~"a"}`,
    expected: `{.foo=~"a"}`,
},

expected: "{.foo=~\"(a|b)\"}"
actual  : "{}"

expected: "{.foo=~\"a\"}"
actual  : "{}"

To Reproduce
Steps to reproduce the behavior:

1. Start Tempo (SHA or version)
2. Perform Operations (Read/Write/Others)

Expected behavior

Environment:

• Infrastructure: [e.g., Kubernetes, bare-metal, laptop]
• Deployment tool: [e.g., helm, jsonnet]

Additional Context