Remove redundant trimming in connection string wizard steps

[Copilot]

Addresses review feedback to remove redundant .trim() calls that were trimming connection strings immediately after they were already trimmed from showInputBox().

Changes

• PromptMongoRUEmulatorConnectionStringStep.ts: Removed duplicate trim of context.connectionString after assignment
• PromptConnectionStringStep.ts: Removed intermediate trimmedConnectionString variable; use newConnectionString directly

// Before
const newConnectionString = (await context.ui.showInputBox({...})).trim();
const trimmedConnectionString = newConnectionString.trim();  // Redundant
const parsed = new DocumentDBConnectionString(trimmedConnectionString);

// After
const newConnectionString = (await context.ui.showInputBox({...})).trim();
const parsed = new DocumentDBConnectionString(newConnectionString);

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