Add filtering and search to list views for various requests

[matthew-li]

Some admin-accessible list views for requests have (a) search and (b) pagination capabilities, while others do not. Ensure that all of these views have both.

From a glance, the following do not:

• New Project Requests
• (MyBRC only) New Vector Project Requests
• Project Renewal Requests
• (MyBRC only) Secure Directory Requests
• (MyBRC only) Service Units Purchase Requests

Avoid duplicating code--refactor common logic so that it is reusable as much as possible. Some reusable constructs may already exist.

[matthew-li]

The beginnings of a template (coldfront/templates/common/list_search.html) for de-duplicating logic that I'd started writing a while back:

<div class="mb-3" id="accordion">
  <div class="card">
    <div class="card-header">
      <a id="expand_button" role="button" class="card-link " data-toggle="collapse" href="#collapseOne">
        <i class="fas fa-filter" aria-hidden="true"></i> Search
        <i id="plus_minus" class="fas {{ list_search_expand_accordion|get_icon }} float-right"></i>
      </a>
    </div>
    <div id="collapseOne" class="collapse {{ list_search_expand_accordion }}" data-parent="#accordion">
      <div class="card-body">
        <form id="filter_form" method="GET" action="{{ list_search_url }}" autocomplete="off">
          {{ list_search_form|crispy }}
          <input type="submit" class="btn btn-primary" value="Search">
          <button id="form_reset_button" type="button" class="btn btn-secondary">Reset</button>
        </form>
      </div>
    </div>
  </div>
</div>
<hr>

{% comment %}
- Usage:
    - View:
        - Add 'expand_list_search_expand_accordion' (str) to context data.
            - Set it to 'show' to have the search tool expanded on page load.
            - Set it to anything else to have the search tool collapsed on page load.
    - Template:
        - Define the URL to search against (probably the URL of the current view).
        - Define arguments to pass to the URL.
        - Include the search tool, passing the URL to it.
        - Example code:
            {% url 'your-url' optional_args=here as list_search_url %}
            {% include 'common/list_search.html' with list_search_url=list_search_url with list_search_form=list_search_form %}
{% endcomment %}

[matthew-li]

@Hzaakk This was in progress by another intern -- see #596 and #600, or feel free to start from scratch.

Can you find a way to refactor common logic as much as possible?

Please make one PR per request type. The new project requests and allowance renewal requests are the most high priority.