Why paths defined in webrestrictions.xml can't contain numbers?

[pitbulk]

Summary

In the Magento enterprise module Webrestriction, at etc/webrestrictions.xsd can be found the pattern:

<xs:restriction base="xs:string">
  <xs:pattern value="[a-zA-Z_]+" />
</xs:restriction>

Is there any reason for not accepting numbers?

I see that in the past similar flexibility was added on other modules, for example the ImportExport.
See #4470

Can we have a similar change applied on Webrestriction module (Enterprise)?

Examples

In my extension I defined actions path as follows:

<action path="pitbulk_saml2_account_forcelogin" type="generic"/>

so I receive the error:

etc/webrestrictions.xml Element 'action', attribute 'path': [facet 'pattern'] The value 'pitbulk_saml2_account_forcelogin' is not accepted by the pattern '[a-zA-Z_]+'.
```

### Proposed solution

Change the pattern:
```
<xs:restriction base="xs:string">
  <xs:pattern value="[a-zA-Z0-9_]+" />
</xs:restriction>
```

### Release note

_No response_

### Triage and priority

- [ ] Severity: **S0** _- Affects critical data or functionality and leaves users without workaround._
- [ ] Severity: **S1** _- Affects critical data or functionality and forces users to employ a workaround._
- [x] Severity: **S2** _- Affects non-critical data or functionality and forces users to employ a workaround._
- [ ] Severity: **S3** _- Affects non-critical data or functionality and does not force users to employ a workaround._
- [ ] Severity: **S4** _- Affects aesthetics, professional look and feel, “quality” or “usability”._

[m2-assistant]

Hi @pitbulk. Thank you for your report.
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