add closing parenthesis to methods completion

[dean-starkware]

This change is 

[dean-starkware]

fixes #5935

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[Draggu]

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[gilbens-starkware]

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[orizi]

Reviewed all commit messages.
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---

crates/cairo-lang-language-server/tests/e2e/completions.rs line 68 at r1 (raw file):

                    if let Some(text) = completion.insert_text {
                        report.push_str(format!("Insert text: {}\n", text).as_str());
                    }

Suggestion:

                    report.push_str(format!("Completion: {}\n", completion.label).as_str());
                    if let Some(text) = completion.insert_text {
                        report.push_str(format!("Insert text: {text}\n").as_str());
                    }

[dean-starkware]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @Arcticae, @mkaput, and @orizi)

---

crates/cairo-lang-language-server/tests/e2e/completions.rs line 68 at r1 (raw file):

                    if let Some(text) = completion.insert_text {
                        report.push_str(format!("Insert text: {}\n", text).as_str());
                    }

Done.

[orizi]

Reviewed 1 of 1 files at r2, all commit messages.
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