[Bug]: Invalid variable renaming in Vs code action

[SasinduDilshara]

Description

Consider following code sample

import ballerina/lang.regexp;

public function main() {
    regexp:RegExp _ = re `(?${""}:)`;
    3;
}

When we select the create variable code action for second statement, the renaming option contains invalid variable name.

Steps to Reproduce

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Affected Version(s)

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OS, DB, other environment details and versions

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Related area

-> Compilation

Related issue(s) (optional)

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Suggested label(s) (optional)

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Suggested assignee(s) (optional)

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[SasinduDilshara]

Another issue in variable renaming.
When we select create variable code action and rename our variable to _, vs code give two choices, first one is keep the variable as _ or keep the variable as '_.
When we choose '_, the code gives compile time error '_' is a keyword, and may not be used as an identifier(BCE3107)

public function main() {
    int '_ = 3; // '_' is a keyword, and may not be used as an identifier(BCE3107
}

[mindula]

related issue #40525

[mindula]

Blocked by #41282