Remove ballerina/regex dependency

[NipunaMadhushan]

Purpose

In some occasions, the following error occurs intermittently.

2024-04-25 09:15:29,335] SEVERE {b7a.log.crash} - 'io.ballerina.runtime.api.values.BString ballerina.regex.1.natives.replaceAll(io.ballerina.runtime.internal.scheduling.Strand, io.ballerina.runtime.api.values.BString, io.ballerina.runtime.api.values.BString, java.lang.Object)' 
java.lang.NoSuchMethodError: 'io.ballerina.runtime.api.values.BString ballerina.regex.1.natives.replaceAll(io.ballerina.runtime.internal.scheduling.Strand, io.ballerina.runtime.api.values.BString, io.ballerina.runtime.api.values.BString, java.lang.Object)'
        at ballerinax.prometheus.0.metric_reporter.getEscapedName(metric_reporter.bal:164)
        at ballerinax.prometheus.0.$value$$anonType$_0.$get$metrics(metric_reporter.bal:68)
        at ballerinax.prometheus.0.$value$$anonType$_0.call(metric_reporter.bal)
        at io.ballerina.runtime.internal.BalRuntime.lambda$getFunction$1(BalRuntime.java:322)
        at io.ballerina.runtime.internal.scheduling.SchedulerItem.execute(SchedulerItem.java:54)
        at io.ballerina.runtime.internal.scheduling.Scheduler.run(Scheduler.java:320)
        at io.ballerina.runtime.internal.scheduling.Scheduler.runSafely(Scheduler.java:287)
        at java.base/java.lang.Thread.run(Thread.java:833)
 
error: java.lang.NoSuchMethodError: 'io.ballerina.runtime.api.values.BString ballerina.regex.1.natives.replaceAll(io.ballerina.runtime.internal.scheduling.Strand, io.ballerina.runtime.api.values.BString, io.ballerina.runtime.api.values.BString, java.lang.Object)'
        at ballerinax.prometheus.0:getEscapedName(metric_reporter.bal:164)
           ballerinax.prometheus.0.$anonType$_0:$get$metrics(metric_reporter.bal:68)

ballerina/regex module has been replaced by the lang.regexp module. Therefore, we can replace the ballerina/regex dependency with lang.regexp.