Alter so labels with numbers and underscores dont get needless backticks

[anderson4j]

Before if for example had relationship rel_123, we autocompleted MATCH (n)-[:rel^] to
MATCH (n)-[:`rel_123`]
Now instead we dont backtick if we have underscore and numbers in label names/rel names/properties and just give
MATCH (n)-[:rel_123]

[changeset-bot]

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Latest commit: ae1cc57

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