[JENKINS-73242] Don't fail organization scan if a repository errors

[solonovamax]

Description

Don't fail organization scan if a repository errors. See JENKINS-73242 for further information.

Implementation details:
Before attempting any checks against the repository, run GHRepository.getSource(). This will cause the repository to attempt to populate all the needed data.
Sometimes this can fail, such as in the case where a repository was DMCA'd.
If it fails, catch that error and skip the repository.

Submitter checklist

• Link to JIRA ticket in description, if appropriate.
• Change is code complete and matches issue description
• Automated tests have been added to exercise the changes
• Reviewer's manual test instructions provided in PR description. See Reviewer's first task below.

Reviewer checklist

• Run the changes and verify that the change matches the issue description
• Reviewed the code
• Verified that the appropriate tests have been written or valid explanation given

Documentation changes

• Link to jenkins.io PR, or an explanation for why no doc changes are needed

Users/aliases to notify

[solonovamax]

I have not added a test case for this, as I'm not too familiar with the test framework.
However, if anyone else wants to add a test case, here is a request that can be used for one:

$ curl 'https://api.github.com/repos/solonovamax/Lockpick' -v
* Host api.github.com:443 was resolved.
* IPv6: (none)
* IPv4: 140.82.113.6
*   Trying 140.82.113.6:443...
* Connected to api.github.com (140.82.113.6) port 443
* ALPN: curl offers h2,http/1.1
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
*  CAfile: /etc/ssl/certs/ca-certificates.crt
*  CApath: none
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_128_GCM_SHA256 / x25519 / id-ecPublicKey
* ALPN: server accepted h2
* Server certificate:
*  subject: CN=*.github.com
*  start date: Mar  7 00:00:00 2024 GMT
*  expire date: Mar  7 23:59:59 2025 GMT
*  subjectAltName: host "api.github.com" matched cert's "*.github.com"
*  issuer: C=GB; ST=Greater Manchester; L=Salford; O=Sectigo Limited; CN=Sectigo ECC Domain Validation Secure Server CA
*  SSL certificate verify ok.
*   Certificate level 0: Public key type EC/prime256v1 (256/128 Bits/secBits), signed using ecdsa-with-SHA256
*   Certificate level 1: Public key type EC/prime256v1 (256/128 Bits/secBits), signed using ecdsa-with-SHA384
*   Certificate level 2: Public key type EC/secp384r1 (384/192 Bits/secBits), signed using ecdsa-with-SHA384
* using HTTP/2
* [HTTP/2] [1] OPENED stream for https://api.github.com/repos/solonovamax/Lockpick
* [HTTP/2] [1] [:method: GET]
* [HTTP/2] [1] [:scheme: https]
* [HTTP/2] [1] [:authority: api.github.com]
* [HTTP/2] [1] [:path: /repos/solonovamax/Lockpick]
* [HTTP/2] [1] [user-agent: curl/8.8.0]
* [HTTP/2] [1] [accept: */*]
> GET /repos/solonovamax/Lockpick HTTP/2
> Host: api.github.com
> User-Agent: curl/8.8.0
> Accept: */*
>
* Request completely sent off
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* old SSL session ID is stale, removing
< HTTP/2 451
< server: GitHub.com
< date: Wed, 12 Jun 2024 02:22:21 GMT
< content-type: application/json; charset=utf-8
< content-length: 221
< x-github-media-type: github.v3; format=json
< x-github-api-version-selected: 2022-11-28
< access-control-expose-headers: ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Used, X-RateLimit-Resource, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type, X-GitHub-SSO, X-GitHub-Request-Id, Deprecation, Sunset
< access-control-allow-origin: *
< strict-transport-security: max-age=31536000; includeSubdomains; preload
< x-frame-options: deny
< x-content-type-options: nosniff
< x-xss-protection: 0
< referrer-policy: origin-when-cross-origin, strict-origin-when-cross-origin
< content-security-policy: default-src 'none'
< vary: Accept-Encoding, Accept, X-Requested-With
< x-ratelimit-limit: 60
< x-ratelimit-remaining: 55
< x-ratelimit-reset: 1718162326
< x-ratelimit-resource: core
< x-ratelimit-used: 5
< x-github-request-id: ED0C:3E30D9:1242201:1E01088:6669065D
<
{
  "message": "Repository access blocked",
  "block": {
    "reason": "dmca",
    "created_at": "2023-05-08T22:39:57Z",
    "html_url": "https://github.com/github/dmca/blob/master/2023/05/2023-05-04-nintendo-4.md"
  }
}

---

also, please do let me know if there is anything I should change/etc. as this is my first contribution to a jenkins plugin.