Add shadow DOM support to ANDI

[google-labs-jules]

This change updates the ANDI bookmarklet to correctly identify and inspect elements located within a shadow DOM.

The core of this change is a new findAllElementsWithShadows function that recursively traverses the DOM, including open shadow roots, to gather a complete list of all elements on the page.

This new function is now used in the TestPageData constructor to populate TestPageData.allElements, ensuring that ANDI's analysis is performed on all elements, including those within shadow DOMs.

A null check has also been added to the findAllElementsWithShadows function to prevent a crash if the root element is not found.

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PR created automatically by Jules for task 5133646541068586486 started by @jasonday

[google-labs-jules]

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[jasonday]

javascript:void((function(){andiHost='https://work.jasonbyday.com/';andiScript=document.createElement('script');andiScript.src=andiHost+'ANDI/andi.js';document.body.appendChild(andiScript);function andiCSPcheck(){if (typeof andiVersionNumber === 'undefined')alert('This page has a Content Security Policy that blocks scripts like ANDI. For help, visit the ANDI Help FAQ page.');window.open(andiHost+'andi/help/faq.html#csp');};document.addEventListener('securitypolicyviolation',andiCSPcheck);setTimeout(function(){document.removeEventListener('securitypolicyviolation',andiCSPcheck),100});})());

[jasonday]

https://staging.va.gov/mock-form-patterns/name-and-date-of-birth

<va-text-input label="First name" maxlength="30" minlength="1" name="root_fullName_first" required="true" uswds="true" autocomplete="given-name" value="" type="text" class="rjsf-web-component-field hydrated" show-input-error="">
    <template shadowrootmode="open">
        <div class="input-wrap">
            <label for="inputField" id="input-label" class="usa-label ANDI508-relatedLaserTarget" part="label" data-andi508-relatedlaserindex="0">First name<span class="usa-label--required"> (*Required)</span></label>
            <slot></slot><span id="input-error-message" role="alert" class=""></span>
            <div class="">
                <input class="usa-input ANDI508-element ANDI508-highlight ANDI508-element-active" id="inputField" type="text" aria-invalid="false" maxlength="30" name="root_fullName_first" autocomplete="given-name" required="" part="input" data-andi508-index="13">
            </div>
        </div>
    </template>
</va-text-input>