docs(agent): add agent observability section

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[sentry]

Bug: The documentation for monitoring PHP agent events is misleading, as it suggests using the "Errors" dataset which omits non-error events like transactions handled by the agent.
_{Severity: LOW}

Suggested Fix

Update the documentation to clarify that the suggested dashboard widget only monitors error events. Alternatively, provide instructions for monitoring all event types handled by the agent, possibly by using a different dataset or multiple widgets, to give a complete view of the agent's activity.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent. Verify if this is a real issue. If it is, propose a fix; if not, explain why it's
not valid.

Location: docs/platforms/php/agent/index.mdx#L125-L131

Potential issue: The documentation instructs users to monitor events handled by the PHP
agent by creating a dashboard widget that queries the "Errors" dataset. This is
misleading because the PHP agent processes various types of events, including errors,
transactions, and profiles, not just errors. The "Errors" dataset likely only contains
error-type events. Consequently, the suggested chart will only show a subset of the
events handled by the agent, potentially leading users to underestimate the agent's
activity, especially if they have performance monitoring (transactions) enabled.

_{Did we get this right? 👍 / 👎 to inform future reviews.}