Fix X-Ray DB subsegment name with JDBC Connection String

[mxiamxia]

Description:
Using the DB span example below, X-Ray exporter failed to generate the expected DB call subsegment names because it could not parse JDBC connection strings that start with the jdbc: prefix.

Span #1
    Trace ID       : 663a0b68a5e3849c09c07f914b3df738
    Parent ID      : 1052e2a4a2516884
    ID             : 374de78b552e23c2
    Name           : orders@no-appsignals-mysql-1.cnkqok6c8mo1.eu-west-1.rds.amazonaws.com
    Kind           : Client
    Start time     : 2024-05-07 11:07:20.62 +0000 UTC
    End time       : 2024-05-07 11:07:20.624 +0000 UTC
    Status code    : Unset
    Status message :
Attributes:
     -> db.connection_string: Str(jdbc:mysql://no-appsignals-mysql-1.cnkqok6c8mo1.eu-west-1.rds.amazonaws.com:3306)
     -> db.name: Str(orders)
     -> db.system: Str(MySQL)
     -> db.user: Str(myuser@10.0.149.233)

Link to tracking Issue:

Testing:
local tests