Encode URL in `add_link`

[ramikg]

This PR includes URL encoding/quoting before adding a link to a finding.

The original motivation for this PR is a problem I've encountered with Slack links (which I'll describe promptly), but I guess non-encoded URLs may cause an issue with other sinks as well, so a general solution is preferred.

The mentioned Slack problem is as follows: Robusta produces a "View Graph" button with a URL including unescaped braces, but these characters don't behave nicely with Slack. Specifically, on the Slack android app, clicking the "View Graph" button will do nothing. (But it works just fine from a browser.)

Here are Slack blocks to demonstrate the problem

{
	"blocks": [
		{
			"type": "actions",
			"elements": [
				{
					"type": "button",
					"text": {
						"type": "plain_text",
						"text": "Won't work from Android app"
					},
					"url": "https://google.com?q={",
					"action_id": "actionId-0"
				}
			]
		},
		{
			"type": "actions",
			"elements": [
				{
					"type": "button",
					"text": {
						"type": "plain_text",
						"text": "Works from Android app"
					},
					"url": "https://google.com?q=",
					"action_id": "actionId-1"
				}
			]
		}
	]
}

As mentioned above, the specific Slack problem is not the main point (you could even say it's an issue in Slack), but it would be good practice to encode the URL before sending it to a sink.

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Walkthrough

Adds a reusable encode_url utility and applies it to link insertion and GitHub markdown transformation so URLs are consistently encoded at source and during rendering.

Changes

Cohort / File(s)	Summary
URL encoding utility src/robusta/utils/common.py	Added encode_url(url: str) -> str that parses a URL, encodes path/query/fragment, reconstructs and returns it; returns "" for empty input.
Reporting link insertion encoding src/robusta/core/reporting/base.py	Imported encode_url. Finding.add_link now assigns link.url = encode_url(link.url) before appending the link; no other logic changes.
Transformer GitHub markdown URL encoding src/robusta/core/sinks/transformer.py	Replaced manual urllib.parse-based URL re-quoting with encode_url(splits[0]); removed direct urllib.parse usage; behavior otherwise unchanged.

Sequence Diagram(s)

sequenceDiagram
    autonumber
    participant Reporter as Finding.add_link
    participant Transformer as Transformer.to_github_markdown
    participant Util as encode_url

    Reporter->>Util: encode_url(link.url)
    Util-->>Reporter: encoded_url
    Reporter->>Reporter: append link with encoded_url

    Transformer->>Util: encode_url(parsed_url)
    Util-->>Transformer: encoded_url
    Transformer->>Transformer: replace and render markdown

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

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📥 Commits

Reviewing files that changed from the base of the PR and between e5a8dfe08c2f467d8390a884ba371d5b1feb51b7 and da32e5002dbf120f4fa8208a2529fbb7c0a5d81e.

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• src/robusta/utils/common.py

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