evaluate2.sh improvements - leaderboard, default SDK

* reset the JDK to the default (21.0.1-open) when no prepare script is provided

* leaderboard improvements - sorting and content

* run sdk install once at the beginning of the script for all the SDKs detected in any of the evaluated prepare scripts

* remove unnecessary code and tweak doc comments

* one more nit

* Don't print rankings values when only 1 fork is being evaluated

* It's been a few hours, so I now have some more rate limit :)

---------

Co-authored-by: Jason Nochlin <hundredwatt@users.noreply.github.com>

github_users.txt

@@ -0,0 +1,50 @@
+Ujjwalbharti;Ujjwal Bharti
+abfrmblr;Abhilash
+ags313;ags
+anandmattikopp;twohardthings
+armandino;Arman Sharif
+artpar;Parth Mudgal
+asun;Alan Sun
+bjhara;Hampus
+coolmineman;Cool_Mineman
+criccomini;Chris Riccomini
+davecom;David Kopec
+davery22;Daniel Avery
+ddimtirov;Dimitar Dimitrov
+ebarlas;Elliot Barlas
+entangled90;Carlo
+fatroom;Roman Romanchuk
+felix19350;Bruno Félix
+filiphr;Filip Hrisafov
+flippingbits;Stefan Sprenger
+fragmede;Samson
+gabrielreid;Gabriel Reid
+hchiorean;Horia Chiorean
+imrafaelmerino;Rafael Merino García
+isolgpus;Jamie Stansfield
+iziamos;John Ziamos
+jgrateron;Jairo Graterón
+jotschi;Johannes Schüth
+kevinmcmurtrie;Kevin McMurtrie
+kgeri;Gergely Kiss
+khmarbaise;Karl Heinz Marbaise
+kuduwa-keshavram;Keshavram Kuduwa
+merykitty;Quan Anh Mai
+moysesb;Moysés Borges Furtado
+mudit-saxena;Mudit Saxena
+nstng;Nils Semmelrock
+obourgain;Olivier Bourgain
+padreati;Aurelian Tutuianu
+palmr;Nick Palmer
+rby;Ramzi Ben Yahya
+richardstartin;Richard Startin
+spullara;Sam Pullara
+royvanrijn;Roy van Rijn
+seijikun;Markus Ebner
+semotpan;Serghei Motpan
+thomaswue;Thomas Wuerthinger
+truelive;Roman Schweitzer
+twobiers;Tobi
+yavuztas;Yavuz Tas
+yehwankim23;김예환 Ye-Hwan Kim (Sam)
+hundredwatt;Jason Nochlin