Use the result of notification hooks

[mostafa]

Ticket(s)

Closes #397.
Related to #468.

Description

Revised version:

Previously, signals emitted by notification hooks were discarded. This PR changes that behavior by ensuring all actions are executed based on the result of all the hooks (including the notification hooks). Currently, running these actions has no immediate impact, as the results are still mostly discarded. However, once new Signals, Actions, and Policies are implemented (see #468 and gatewayd-io/proposals#5), these results will be utilized effectively.

Related PRs

N/A

Development Checklist

• I have added a descriptive title to this PR.
• I have squashed related commits together.
• I have rebased my branch on top of the latest main branch.
• I have performed a self-review of my own code.
• I have commented on my code, particularly in hard-to-understand areas.
• I have added docstring(s) to my code.
• I have made corresponding changes to the documentation (docs).
• I have updated docs using make gen-docs command.
• I have added tests for my changes.
• I have signed all the commits.

Legal Checklist

• I have read the CONTRIBUTING document.
• I have read and understood the Code of Conduct.
• I have read and agreed to the Apache CLA (required).
• I have read and agreed to the LICENSE (required).

[github-actions]

Overview

Image reference	ghcr.io/gatewayd-io/gatewayd:dc5759a	gatewaydio/gatewayd:latest
- digest	bb9330dc9844	c0d87a848696
- tag	dc5759a	latest
- provenance		9ec6b54
- vulnerabilities
- platform	linux/amd64	linux/amd64
- size	19 MB	17 MB (-2.2 MB)
- packages	136	132 (-4)
Base Image	alpine:3 also known as: • 3.20 • 3.20.3 • latest	alpine:3.20 also known as: • 3 • 3.20.3 • latest
- vulnerabilities

Packages and Vulnerabilities (5 package changes and 0 vulnerability changes)

• ➖ 3 packages removed
• ♾️ 2 packages changed
• 127 packages unchanged

Changes for packages of type apk (3 changes)

	Package	Version ghcr.io/gatewayd-io/gatewayd:dc5759a	Version gatewaydio/gatewayd:latest
➖	ca-certificates	20240705-r0
➖	openssl	3.3.2-r0
➖	pax-utils	1.3.7-r2

Changes for packages of type golang (2 changes)

	Package	Version ghcr.io/gatewayd-io/gatewayd:dc5759a	Version gatewaydio/gatewayd:latest
♾️	github.com/gatewayd-io/gatewayd	(devel)	0.9.8
♾️	stdlib	go1.23.2	1.23.1

[sinadarbouy]

LGTM👍