Replace mentions of "ev1" with more abstract terminology

[Copilot]

This PR replaces all specific mentions of "ev1" in the documentation with more abstract terminology to improve clarity and maintainability.

Changes Made

Updated documentation in two files to replace "ev1 request URL" with "the request URL":

• apis/frontend/implementation-guide-session-api/record-attributions.md
• apis/frontend/js-apis/record-attribution.md

The changes affect three event type descriptions in the attribution documentation:

• External Campaign (EC): Updated to reference "the request URL" instead of the specific technical term "ev1"
• Custom Campaign (CC): Same update for consistency
• Source (SRC): Same update for consistency

Rationale

The original "ev1" terminology was overly specific and technical. By using "the request URL", the documentation becomes:

• More accessible to developers unfamiliar with internal naming conventions
• More maintainable if underlying implementation details change
• Consistent with the goal of providing abstract, implementation-agnostic documentation

All functionality remains unchanged - this is purely a documentation clarity improvement.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• esm.ubuntu.com
  • Triggering command: /usr/lib/apt/methods/https (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Replace mentions of ev1</issue_title>
<issue_description>Replace mentions of ev1 with something more abstract</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #310

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