fuzz: rename the longest test samples

"meson test" uses a test name generated from the file name and those long names
cause the test log output to exceed terminal width which looks bad. Let's replace
some long names with more-meaningful names that actually say something about
the tests.

diff --git a/test/fuzz/fuzz-catalog/clusterfuzz-testcase-minimized-fuzz-catalog-5674475278827520 b/test/fuzz/fuzz-catalog/language-too-short
similarity index 100%
rename from test/fuzz/fuzz-catalog/clusterfuzz-testcase-minimized-fuzz-catalog-5674475278827520
rename to test/fuzz/fuzz-catalog/language-too-short

diff --git a/test/fuzz/fuzz-dhcp-client/minimized-from-555a2b073b8d208655b68c294f8dfd592a11e50a b/test/fuzz/fuzz-dhcp-client/parse-memleak
similarity index 100%
rename from test/fuzz/fuzz-dhcp-client/minimized-from-555a2b073b8d208655b68c294f8dfd592a11e50a
rename to test/fuzz/fuzz-dhcp-client/parse-memleak

diff --git a/test/fuzz/fuzz-dhcp-server-relay-message/clusterfuzz-testcase-minimized-fuzz-dhcp-server-relay-message-4972399731277824 b/test/fuzz/fuzz-dhcp-server-relay-message/too-large-packet
similarity index 100%
rename from test/fuzz/fuzz-dhcp-server-relay-message/clusterfuzz-testcase-minimized-fuzz-dhcp-server-relay-message-4972399731277824
rename to test/fuzz/fuzz-dhcp-server-relay-message/too-large-packet

diff --git a/test/fuzz/fuzz-dhcp-server/clusterfuzz-testcase-minimized-fuzz-dhcp-server-4916534286352384 b/test/fuzz/fuzz-dhcp-server/duplicate-input-data
similarity index 100%
rename from test/fuzz/fuzz-dhcp-server/clusterfuzz-testcase-minimized-fuzz-dhcp-server-4916534286352384
rename to test/fuzz/fuzz-dhcp-server/duplicate-input-data