fix(gdb/mysql): always URL-encode timezone value in DSN to prevent '+' from being interpreted as space (#4759) [fj4WqyCCw3C5ShR1RfB7MoBPTpkRrBFYP1uT35g3MvT]

[waterWang]

fix #4759

Problem

When setting a MySQL timezone value containing '+' (e.g., '+00:00'), the configNodeToSource function only URL-encodes the timezone if it contains '/'. The '+' character is not encoded, causing the Go MySQL driver to interpret it as a space in the query string, resulting in:

unknown time zone ' 00:00'

Fix

Always URL-encode the timezone value with url.QueryEscape instead of only when it contains '/'. This ensures special characters like '+', ':', and quotes are correctly encoded.

- if strings.Contains(config.Timezone, "/") {
-     config.Timezone = url.QueryEscape(config.Timezone)
- }
+ config.Timezone = url.QueryEscape(config.Timezone)

Verification

• url.QueryEscape(UTC) → UTC (no change for safe values)
• url.QueryEscape(Asia/Shanghai) → Asia%2FShanghai (same as before)
• url.QueryEscape(+00:00) → %27%2B00%3A00%27 (now correctly encoded)
• The strings import is no longer needed and has been removed.