Fix S2857 FP: Rule is not checking SQL keywords in const interepolated string

[cristian-ambrosini-sonarsource]

Description

S2857 fail to check for SQL keywords inside a:

• constant interpolated string:
• interpolated string with nameof expression

using System.Data.SqlClient;

public void MyMethod(string unknownValue)
{
  const string One = "One";
  const string myString = $"{One}Two"; // Noncompliant FP
  const string myString1 = $"{nameof(One)}Two"; // Noncompliant FP
  string myString2 = $"{nameof(unknownValue)}Two"; // Noncompliant FP
}

[martin-strecker-sonarsource]

see also #6126

[cristian-ambrosini-sonarsource]

As reported by #8102, non-const string are also raising FPs:

    string nonConstOne = "One";
    string empty = string.Empty;

    string s1 = $"{nonConstOne}";              // Compliant
    string s2 = $"{nonConstOne}Two";           // Noncompliant FP
    string s3 = $"{empty}";                    // Compliant
    string s4 = $"{empty}Two";                 // Compliant

    string s5 = $"{{{nonConstOne}}}";          // Noncompliant FP
                                               // Noncompliant@-1 FP