Rename regex search tool to grep and accept an include glob pattern (#29100)

This PR renames the `regex_search` tool to `grep` because I think it
conveys more meaning to the model, the idea of searching the filesystem
with a regular expression. It's also one word and the model seems to be
using it effectively after some additional prompt tuning.

It also takes an include pattern to filter on the specific files we try
to search. I'd like to encourage the model to scope its searches more
aggressively, as in my testing, I'm only seeing it filter on file
extension.

Release Notes:

- N/A

crates/search/src/buffer_search.rs

@@ -1252,6 +1252,7 @@ impl BufferSearchBar {
                                 .contains(SearchOptions::ONE_MATCH_PER_LINE),
                             Default::default(),
                             Default::default(),
+                            false,
                             None,
                         ) {
                             Ok(query) => query.with_replacement(self.replacement(cx)),
@@ -1270,6 +1271,7 @@ impl BufferSearchBar {
                             false,
                             Default::default(),
                             Default::default(),
+                            false,
                             None,
                         ) {
                             Ok(query) => query.with_replacement(self.replacement(cx)),

crates/search/src/project_search.rs

@@ -1047,6 +1047,19 @@ impl ProjectSearchView {
                 }
             };
 
+        // If the project contains multiple visible worktrees, we match the
+        // include/exclude patterns against full paths to allow them to be
+        // disambiguated. For single worktree projects we use worktree relative
+        // paths for convenience.
+        let match_full_paths = self
+            .entity
+            .read(cx)
+            .project
+            .read(cx)
+            .visible_worktrees(cx)
+            .count()
+            > 1;
+
         let query = if self.search_options.contains(SearchOptions::REGEX) {
             match SearchQuery::regex(
                 text,
@@ -1057,6 +1070,7 @@ impl ProjectSearchView {
                     .contains(SearchOptions::ONE_MATCH_PER_LINE),
                 included_files,
                 excluded_files,
+                match_full_paths,
                 open_buffers,
             ) {
                 Ok(query) => {
@@ -1084,6 +1098,7 @@ impl ProjectSearchView {
                 self.search_options.contains(SearchOptions::INCLUDE_IGNORED),
                 included_files,
                 excluded_files,
+                match_full_paths,
                 open_buffers,
             ) {
                 Ok(query) => {